3rdparty: update ocornut-imgui

3rdparty/ocornut-imgui/imgui.h

@@ -1,4 +1,4 @@
-// dear imgui, v1.74 WIP
+// dear imgui, v1.75 WIP
 // (headers)
 
 // See imgui.cpp file for documentation.
@@ -48,8 +48,8 @@ Index of this file:
 
 // Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals. Work in progress versions typically starts at XYY99 then bounce up to XYY00, XYY01 etc. when release tagging happens)
-#define IMGUI_VERSION               "1.74 WIP"
-#define IMGUI_VERSION_NUM           17301
+#define IMGUI_VERSION               "1.75 WIP"
+#define IMGUI_VERSION_NUM           17401
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 #define IMGUI_HAS_VIEWPORT          1 // Viewport WIP branch
 #define IMGUI_HAS_DOCK              1 // Docking WIP branch
@@ -83,6 +83,8 @@ Index of this file:
 #else
 #define IM_OFFSETOF(_TYPE,_MEMBER)  ((size_t)&(((_TYPE*)0)->_MEMBER))           // Offset of _MEMBER within _TYPE. Old style macro.
 #endif
+#define IM_UNICODE_CODEPOINT_MAX     0xFFFF                                     // Last Unicode code point supported by this build.
+#define IM_UNICODE_CODEPOINT_INVALID 0xFFFD                                     // Standard invalid Unicode code point.
 
 // Warnings
 #if defined(__clang__)
@@ -143,6 +145,7 @@ typedef int ImGuiDataType;          // -> enum ImGuiDataType_        // Enum: A
 typedef int ImGuiDir;               // -> enum ImGuiDir_             // Enum: A cardinal direction
 typedef int ImGuiKey;               // -> enum ImGuiKey_             // Enum: A key identifier (ImGui-side enum)
 typedef int ImGuiNavInput;          // -> enum ImGuiNavInput_        // Enum: An input identifier for navigation
+typedef int ImGuiMouseButton;       // -> enum ImGuiMouseButton_     // Enum: A mouse button identifier (0=left, 1=right, 2=middle)
 typedef int ImGuiMouseCursor;       // -> enum ImGuiMouseCursor_     // Enum: A mouse cursor identifier
 typedef int ImGuiStyleVar;          // -> enum ImGuiStyleVar_        // Enum: A variable identifier for styling
 typedef int ImDrawCornerFlags;      // -> enum ImDrawCornerFlags_    // Flags: for ImDrawList::AddRect(), AddRectFilled() etc.
@@ -443,6 +446,7 @@ namespace ImGui
     // - Adjust format string to decorate the value with a prefix, a suffix, or adapt the editing and display precision e.g. "%.3f" -> 1.234; "%5.2f secs" -> 01.23 secs; "Biscuit: %.0f" -> Biscuit: 1; etc.
     // - Speed are per-pixel of mouse movement (v_speed=0.2f: mouse needs to move by 5 pixels to increase value by 1). For gamepad/keyboard navigation, minimum speed is Max(v_speed, minimum_step_at_given_precision).
     // - Use v_min < v_max to clamp edits to given limits. Note that CTRL+Click manual input can override those limits.
+    // - Use v_max = FLT_MAX / INT_MAX etc to avoid clamping to a maximum, same with v_min = -FLT_MAX / INT_MIN to avoid clamping to a minimum.
     // - Use v_min > v_max to lock edits.
     IMGUI_API bool          DragFloat(const char* label, float* v, float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", float power = 1.0f);     // If v_min >= v_max we have no bound
     IMGUI_API bool          DragFloat2(const char* label, float v[2], float v_speed = 1.0f, float v_min = 0.0f, float v_max = 0.0f, const char* format = "%.3f", float power = 1.0f);
@@ -476,7 +480,7 @@ namespace ImGui
     IMGUI_API bool          VSliderScalar(const char* label, const ImVec2& size, ImGuiDataType data_type, void* p_data, const void* p_min, const void* p_max, const char* format = NULL, float power = 1.0f);
 
     // Widgets: Input with Keyboard
-    // - If you want to use InputText() with a dynamic string type such as std::string or your own, see misc/cpp/imgui_stdlib.h
+    // - If you want to use InputText() with std::string or any custom dynamic string type, see misc/cpp/imgui_stdlib.h and comments in imgui_demo.cpp.
     // - Most of the ImGuiInputTextFlags flags are only useful for InputText() and not for InputFloatX, InputIntX, InputDouble etc.
     IMGUI_API bool          InputText(const char* label, char* buf, size_t buf_size, ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
     IMGUI_API bool          InputTextMultiline(const char* label, char* buf, size_t buf_size, const ImVec2& size = ImVec2(0,0), ImGuiInputTextFlags flags = 0, ImGuiInputTextCallback callback = NULL, void* user_data = NULL);
@@ -575,22 +579,24 @@ namespace ImGui
     // - Unless modal, they can be closed by clicking anywhere outside them, or by pressing ESCAPE.
     // - Their visibility state (~bool) is held internally by imgui instead of being held by the programmer as we are used to with regular Begin() calls.
     //   User can manipulate the visibility state by calling OpenPopup().
+    // - We default to use the right mouse (ImGuiMouseButton_Right=1) for the Popup Context functions.
     // (*) You can use IsItemHovered(ImGuiHoveredFlags_AllowWhenBlockedByPopup) to bypass it and detect hovering even when normally blocked by a popup.
     // Those three properties are connected. The library needs to hold their visibility state because it can close popups at any time.
     IMGUI_API void          OpenPopup(const char* str_id);                                      // call to mark popup as open (don't call every frame!). popups are closed when user click outside, or if CloseCurrentPopup() is called within a BeginPopup()/EndPopup() block. By default, Selectable()/MenuItem() are calling CloseCurrentPopup(). Popup identifiers are relative to the current ID-stack (so OpenPopup and BeginPopup needs to be at the same level).
     IMGUI_API bool          BeginPopup(const char* str_id, ImGuiWindowFlags flags = 0);                                             // return true if the popup is open, and you can start outputting to it. only call EndPopup() if BeginPopup() returns true!
-    IMGUI_API bool          BeginPopupContextItem(const char* str_id = NULL, int mouse_button = 1);                                 // helper to open and begin popup when clicked on last item. if you can pass a NULL str_id only if the previous item had an id. If you want to use that on a non-interactive item such as Text() you need to pass in an explicit ID here. read comments in .cpp!
-    IMGUI_API bool          BeginPopupContextWindow(const char* str_id = NULL, int mouse_button = 1, bool also_over_items = true);  // helper to open and begin popup when clicked on current window.
-    IMGUI_API bool          BeginPopupContextVoid(const char* str_id = NULL, int mouse_button = 1);                                 // helper to open and begin popup when clicked in void (where there are no imgui windows).
+    IMGUI_API bool          BeginPopupContextItem(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1);                    // helper to open and begin popup when clicked on last item. if you can pass a NULL str_id only if the previous item had an id. If you want to use that on a non-interactive item such as Text() you need to pass in an explicit ID here. read comments in .cpp!
+    IMGUI_API bool          BeginPopupContextWindow(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1, bool also_over_items = true);  // helper to open and begin popup when clicked on current window.
+    IMGUI_API bool          BeginPopupContextVoid(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1);                    // helper to open and begin popup when clicked in void (where there are no imgui windows).
     IMGUI_API bool          BeginPopupModal(const char* name, bool* p_open = NULL, ImGuiWindowFlags flags = 0);                     // modal dialog (regular window with title bar, block interactions behind the modal window, can't close the modal window by clicking outside)
     IMGUI_API void          EndPopup();                                                                                             // only call EndPopup() if BeginPopupXXX() returns true!
-    IMGUI_API bool          OpenPopupOnItemClick(const char* str_id = NULL, int mouse_button = 1);                                  // helper to open popup when clicked on last item (note: actually triggers on the mouse _released_ event to be consistent with popup behaviors). return true when just opened.
+    IMGUI_API bool          OpenPopupOnItemClick(const char* str_id = NULL, ImGuiMouseButton mouse_button = 1);                     // helper to open popup when clicked on last item (note: actually triggers on the mouse _released_ event to be consistent with popup behaviors). return true when just opened.
     IMGUI_API bool          IsPopupOpen(const char* str_id);                                    // return true if the popup is open at the current begin-ed level of the popup stack.
     IMGUI_API void          CloseCurrentPopup();                                                // close the popup we have begin-ed into. clicking on a MenuItem or Selectable automatically close the current popup.
 
     // Columns
     // - You can also use SameLine(pos_x) to mimic simplified columns.
     // - The columns API is work-in-progress and rather lacking (columns are arguably the worst part of dear imgui at the moment!)
+    // - There is a maximum of 64 columns.
     // - By end of the 2019 we will expose a new 'Table' api which will replace columns.
     IMGUI_API void          Columns(int count = 1, const char* id = NULL, bool border = true);
     IMGUI_API void          NextColumn();                                                       // next column, defaults to current row or next row if the current row is finished
@@ -658,7 +664,7 @@ namespace ImGui
     IMGUI_API bool          IsItemHovered(ImGuiHoveredFlags flags = 0);                         // is the last item hovered? (and usable, aka not blocked by a popup, etc.). See ImGuiHoveredFlags for more options.
     IMGUI_API bool          IsItemActive();                                                     // is the last item active? (e.g. button being held, text field being edited. This will continuously return true while holding mouse button on an item. Items that don't interact will always return false)
     IMGUI_API bool          IsItemFocused();                                                    // is the last item focused for keyboard/gamepad navigation?
-    IMGUI_API bool          IsItemClicked(int mouse_button = 0);                                // is the last item clicked? (e.g. button/node just clicked on) == IsMouseClicked(mouse_button) && IsItemHovered()
+    IMGUI_API bool          IsItemClicked(ImGuiMouseButton mouse_button = 0);                   // is the last item clicked? (e.g. button/node just clicked on) == IsMouseClicked(mouse_button) && IsItemHovered()
     IMGUI_API bool          IsItemVisible();                                                    // is the last item visible? (items may be out of sight because of clipping/scrolling)
     IMGUI_API bool          IsItemEdited();                                                     // did the last item modify its underlying value this frame? or was pressed? This is generally the same as the "bool" return value of many widgets.
     IMGUI_API bool          IsItemActivated();                                                  // was the last item just made active (item was previously inactive).
@@ -697,27 +703,34 @@ namespace ImGui
     IMGUI_API void          ColorConvertRGBtoHSV(float r, float g, float b, float& out_h, float& out_s, float& out_v);
     IMGUI_API void          ColorConvertHSVtoRGB(float h, float s, float v, float& out_r, float& out_g, float& out_b);
 
-    // Inputs Utilities
+    // Inputs Utilities: Keyboard
+    // - For 'int user_key_index' you can use your own indices/enums according to how your backend/engine stored them in io.KeysDown[].
+    // - We don't know the meaning of those value. You can use GetKeyIndex() to map a ImGuiKey_ value into the user index.
     IMGUI_API int           GetKeyIndex(ImGuiKey imgui_key);                                    // map ImGuiKey_* values into user's key index. == io.KeyMap[key]
-    IMGUI_API bool          IsKeyDown(int user_key_index);                                      // is key being held. == io.KeysDown[user_key_index]. note that imgui doesn't know the semantic of each entry of io.KeysDown[]. Use your own indices/enums according to how your backend/engine stored them into io.KeysDown[]!
-    IMGUI_API bool          IsKeyPressed(int user_key_index, bool repeat = true);               // was key pressed (went from !Down to Down). if repeat=true, uses io.KeyRepeatDelay / KeyRepeatRate
-    IMGUI_API bool          IsKeyReleased(int user_key_index);                                  // was key released (went from Down to !Down)..
+    IMGUI_API bool          IsKeyDown(int user_key_index);                                      // is key being held. == io.KeysDown[user_key_index].
+    IMGUI_API bool          IsKeyPressed(int user_key_index, bool repeat = true);               // was key pressed (went from !Down to Down)? if repeat=true, uses io.KeyRepeatDelay / KeyRepeatRate
+    IMGUI_API bool          IsKeyReleased(int user_key_index);                                  // was key released (went from Down to !Down)?
     IMGUI_API int           GetKeyPressedAmount(int key_index, float repeat_delay, float rate); // uses provided repeat rate/delay. return a count, most often 0 or 1 but might be >1 if RepeatRate is small enough that DeltaTime > RepeatRate
-    IMGUI_API bool          IsMouseDown(int button);                                            // is mouse button held (0=left, 1=right, 2=middle)
-    IMGUI_API bool          IsAnyMouseDown();                                                   // is any mouse button held
-    IMGUI_API bool          IsMouseClicked(int button, bool repeat = false);                    // did mouse button clicked (went from !Down to Down) (0=left, 1=right, 2=middle)
-    IMGUI_API bool          IsMouseDoubleClicked(int button);                                   // did mouse button double-clicked. a double-click returns false in IsMouseClicked(). uses io.MouseDoubleClickTime.
-    IMGUI_API bool          IsMouseReleased(int button);                                        // did mouse button released (went from Down to !Down)
-    IMGUI_API bool          IsMouseDragging(int button = 0, float lock_threshold = -1.0f);      // is mouse dragging. if lock_threshold < -1.0f uses io.MouseDraggingThreshold
-    IMGUI_API bool          IsMouseHoveringRect(const ImVec2& r_min, const ImVec2& r_max, bool clip = true);  // is mouse hovering given bounding rect (in screen space). clipped by current clipping settings, but disregarding of other consideration of focus/window ordering/popup-block.
-    IMGUI_API bool          IsMousePosValid(const ImVec2* mouse_pos = NULL);                    // by convention we use (-FLT_MAX,-FLT_MAX) to denote that there is no mouse
+    IMGUI_API void          CaptureKeyboardFromApp(bool want_capture_keyboard_value = true);    // attention: misleading name! manually override io.WantCaptureKeyboard flag next frame (said flag is entirely left for your application to handle). e.g. force capture keyboard when your widget is being hovered. This is equivalent to setting "io.WantCaptureKeyboard = want_capture_keyboard_value"; after the next NewFrame() call.
+
+    // Inputs Utilities: Mouse
+    // - To refer to a mouse button, you may use named enums in your code e.g. ImGuiMouseButton_Left, ImGuiMouseButton_Right.
+    // - You can also use regular integer: it is forever guaranteed that 0=Left, 1=Right, 2=Middle.
+    // - Dragging operations are only reported after mouse has moved a certain distance away from the initial clicking position (see 'lock_threshold' and 'io.MouseDraggingThreshold')
+    IMGUI_API bool          IsMouseDown(ImGuiMouseButton button);                               // is mouse button held?
+    IMGUI_API bool          IsMouseClicked(ImGuiMouseButton button, bool repeat = false);       // did mouse button clicked? (went from !Down to Down)
+    IMGUI_API bool          IsMouseReleased(ImGuiMouseButton button);                           // did mouse button released? (went from Down to !Down)
+    IMGUI_API bool          IsMouseDoubleClicked(ImGuiMouseButton button);                      // did mouse button double-clicked? a double-click returns false in IsMouseClicked(). uses io.MouseDoubleClickTime.
+    IMGUI_API bool          IsMouseHoveringRect(const ImVec2& r_min, const ImVec2& r_max, bool clip = true);// is mouse hovering given bounding rect (in screen space). clipped by current clipping settings, but disregarding of other consideration of focus/window ordering/popup-block.
+    IMGUI_API bool          IsMousePosValid(const ImVec2* mouse_pos = NULL);                    // by convention we use (-FLT_MAX,-FLT_MAX) to denote that there is no mouse available
+    IMGUI_API bool          IsAnyMouseDown();                                                   // is any mouse button held?
     IMGUI_API ImVec2        GetMousePos();                                                      // shortcut to ImGui::GetIO().MousePos provided by user, to be consistent with other calls
-    IMGUI_API ImVec2        GetMousePosOnOpeningCurrentPopup();                                 // retrieve backup of mouse position at the time of opening popup we have BeginPopup() into
-    IMGUI_API ImVec2        GetMouseDragDelta(int button = 0, float lock_threshold = -1.0f);    // return the delta from the initial clicking position while the mouse button is pressed or was just released. This is locked and return 0.0f until the mouse moves past a distance threshold at least once. If lock_threshold < -1.0f uses io.MouseDraggingThreshold.
-    IMGUI_API void          ResetMouseDragDelta(int button = 0);                                //
+    IMGUI_API ImVec2        GetMousePosOnOpeningCurrentPopup();                                 // retrieve mouse position at the time of opening popup we have BeginPopup() into (helper to avoid user backing that value themselves)
+    IMGUI_API bool          IsMouseDragging(ImGuiMouseButton button, float lock_threshold = -1.0f);         // is mouse dragging? (if lock_threshold < -1.0f, uses io.MouseDraggingThreshold)
+    IMGUI_API ImVec2        GetMouseDragDelta(ImGuiMouseButton button = 0, float lock_threshold = -1.0f);   // return the delta from the initial clicking position while the mouse button is pressed or was just released. This is locked and return 0.0f until the mouse moves past a distance threshold at least once (if lock_threshold < -1.0f, uses io.MouseDraggingThreshold)
+    IMGUI_API void          ResetMouseDragDelta(ImGuiMouseButton button = 0);                   //
     IMGUI_API ImGuiMouseCursor GetMouseCursor();                                                // get desired cursor type, reset in ImGui::NewFrame(), this is updated during the frame. valid before Render(). If you use software rendering by setting io.MouseDrawCursor ImGui will render those for you
-    IMGUI_API void          SetMouseCursor(ImGuiMouseCursor type);                              // set desired cursor type
-    IMGUI_API void          CaptureKeyboardFromApp(bool want_capture_keyboard_value = true);    // attention: misleading name! manually override io.WantCaptureKeyboard flag next frame (said flag is entirely left for your application to handle). e.g. force capture keyboard when your widget is being hovered. This is equivalent to setting "io.WantCaptureKeyboard = want_capture_keyboard_value"; after the next NewFrame() call.
+    IMGUI_API void          SetMouseCursor(ImGuiMouseCursor cursor_type);                       // set desired cursor type
     IMGUI_API void          CaptureMouseFromApp(bool want_capture_mouse_value = true);          // attention: misleading name! manually override io.WantCaptureMouse flag next frame (said flag is entirely left for your application to handle). This is equivalent to setting "io.WantCaptureMouse = want_capture_mouse_value;" after the next NewFrame() call.
 
     // Clipboard Utilities (also see the LogToClipboard() function to capture or output text data to the clipboard)
@@ -795,8 +808,8 @@ enum ImGuiWindowFlags_
     ImGuiWindowFlags_DockNodeHost           = 1 << 29   // Don't use! For internal use by Begin()/NewFrame()
 
     // [Obsolete]
-    //ImGuiWindowFlags_ShowBorders          = 1 << 7,   // --> Set style.FrameBorderSize=1.0f / style.WindowBorderSize=1.0f to enable borders around windows and items
-    //ImGuiWindowFlags_ResizeFromAnySide    = 1 << 17,  // --> Set io.ConfigWindowsResizeFromEdges and make sure mouse cursors are supported by back-end (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors)
+    //ImGuiWindowFlags_ShowBorders          = 1 << 7,   // --> Set style.FrameBorderSize=1.0f or style.WindowBorderSize=1.0f to enable borders around items or windows.
+    //ImGuiWindowFlags_ResizeFromAnySide    = 1 << 17,  // --> Set io.ConfigWindowsResizeFromEdges=true and make sure mouse cursors are supported by back-end (io.BackendFlags & ImGuiBackendFlags_HasMouseCursors)
 };
 
 // Flags for ImGui::InputText()
@@ -847,11 +860,6 @@ enum ImGuiTreeNodeFlags_
     ImGuiTreeNodeFlags_NavLeftJumpsBackHere = 1 << 13,  // (WIP) Nav: left direction may move to this TreeNode() from any of its child (items submitted between TreeNode and TreePop)
     //ImGuiTreeNodeFlags_NoScrollOnOpen     = 1 << 14,  // FIXME: TODO: Disable automatic scroll on TreePop() if node got just open and contents is not visible
     ImGuiTreeNodeFlags_CollapsingHeader     = ImGuiTreeNodeFlags_Framed | ImGuiTreeNodeFlags_NoTreePushOnOpen | ImGuiTreeNodeFlags_NoAutoOpenOnLog
-
-    // Obsolete names (will be removed)
-#ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-    , ImGuiTreeNodeFlags_AllowOverlapMode = ImGuiTreeNodeFlags_AllowItemOverlap // [renamed in 1.53]
-#endif
 };
 
 // Flags for ImGui::Selectable()
@@ -1092,7 +1100,7 @@ enum ImGuiBackendFlags_
     ImGuiBackendFlags_HasGamepad            = 1 << 0,   // Back-end Platform supports gamepad and currently has one connected.
     ImGuiBackendFlags_HasMouseCursors       = 1 << 1,   // Back-end Platform supports honoring GetMouseCursor() value to change the OS cursor shape.
     ImGuiBackendFlags_HasSetMousePos        = 1 << 2,   // Back-end Platform supports io.WantSetMousePos requests to reposition the OS mouse position (only used if ImGuiConfigFlags_NavEnableSetMousePos is set).
-    ImGuiBackendFlags_RendererHasVtxOffset  = 1 << 3,   // Back-end Renderer supports ImDrawCmd::VtxOffset. This enables output of large meshes (64K+ vertices) while still using 16-bits indices.
+    ImGuiBackendFlags_RendererHasVtxOffset  = 1 << 3,   // Back-end Renderer supports ImDrawCmd::VtxOffset. This enables output of large meshes (64K+ vertices) while still using 16-bit indices.
 
     // [BETA] Viewports
     ImGuiBackendFlags_PlatformHasViewports  = 1 << 10,  // Back-end Platform supports multiple viewports.
@@ -1158,9 +1166,7 @@ enum ImGuiCol_
     // Obsolete names (will be removed)
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
     , ImGuiCol_ModalWindowDarkening = ImGuiCol_ModalWindowDimBg                      // [renamed in 1.63]
-    , ImGuiCol_ChildWindowBg = ImGuiCol_ChildBg                                      // [renamed in 1.53]
-    //ImGuiCol_CloseButton, ImGuiCol_CloseButtonActive, ImGuiCol_CloseButtonHovered, // [unused since 1.60+] the close button now uses regular button colors.
-    //ImGuiCol_ComboBg,                                                              // [unused since 1.53+] ComboBg has been merged with PopupBg, so a redirect isn't accurate.
+    //, ImGuiCol_CloseButton, ImGuiCol_CloseButtonActive, ImGuiCol_CloseButtonHovered// [unused since 1.60+] the close button now uses regular button colors.
 #endif
 };
 
@@ -1197,8 +1203,7 @@ enum ImGuiStyleVar_
 
     // Obsolete names (will be removed)
 #ifndef IMGUI_DISABLE_OBSOLETE_FUNCTIONS
-    , ImGuiStyleVar_Count_ = ImGuiStyleVar_COUNT                        // [renamed in 1.60]
-    , ImGuiStyleVar_ChildWindowRounding = ImGuiStyleVar_ChildRounding   // [renamed in 1.53]
+    , ImGuiStyleVar_Count_ = ImGuiStyleVar_COUNT                    // [renamed in 1.60]
 #endif
 };
 
@@ -1247,6 +1252,16 @@ enum ImGuiColorEditFlags_
 #endif
 };
 
+// Identify a mouse button.
+// Those values are guaranteed to be stable and we frequently use 0/1 directly. Named enums provided for convenience.
+enum ImGuiMouseButton_
+{
+    ImGuiMouseButton_Left = 0,
+    ImGuiMouseButton_Right = 1,
+    ImGuiMouseButton_Middle = 2,
+    ImGuiMouseButton_COUNT = 5
+};
+
 // Enumeration for GetMouseCursor()
 // User code may request binding to display given cursor by calling SetMouseCursor(), which is why we have some cursors that are marked unused here
 enum ImGuiMouseCursor_
@@ -1260,6 +1275,7 @@ enum ImGuiMouseCursor_
     ImGuiMouseCursor_ResizeNESW,        // When hovering over the bottom-left corner of a window
     ImGuiMouseCursor_ResizeNWSE,        // When hovering over the bottom-right corner of a window
     ImGuiMouseCursor_Hand,              // (Unused by Dear ImGui functions. Use for e.g. hyperlinks)
+    ImGuiMouseCursor_NotAllowed,        // When hovering something with disallowed interaction. Usually a crossed circle.
     ImGuiMouseCursor_COUNT
 
     // Obsolete names (will be removed)
@@ -1268,7 +1284,7 @@ enum ImGuiMouseCursor_
 #endif
 };
 
-// Enumateration for ImGui::SetWindow***(), SetNextWindow***(), SetNextItem***() functions
+// Enumeration for ImGui::SetWindow***(), SetNextWindow***(), SetNextItem***() functions
 // Represent a condition.
 // Important: Treat as a regular enum! Do NOT combine multiple values using binary operators! All the functions above treat 0 as a shortcut to ImGuiCond_Always.
 enum ImGuiCond_
@@ -1345,6 +1361,7 @@ struct ImVector
     inline int          _grow_capacity(int sz) const        { int new_capacity = Capacity ? (Capacity + Capacity/2) : 8; return new_capacity > sz ? new_capacity : sz; }
     inline void         resize(int new_size)                { if (new_size > Capacity) reserve(_grow_capacity(new_size)); Size = new_size; }
     inline void         resize(int new_size, const T& v)    { if (new_size > Capacity) reserve(_grow_capacity(new_size)); if (new_size > Size) for (int n = Size; n < new_size; n++) memcpy(&Data[n], &v, sizeof(v)); Size = new_size; }
+    inline void         shrink(int new_size)                { IM_ASSERT(new_size <= Size); Size = new_size; } // Resize a vector to a smaller size, guaranteed not to cause a reallocation
     inline void         reserve(int new_capacity)           { if (new_capacity <= Capacity) return; T* new_data = (T*)IM_ALLOC((size_t)new_capacity * sizeof(T)); if (Data) { memcpy(new_data, Data, (size_t)Size * sizeof(T)); IM_FREE(Data); } Data = new_data; Capacity = new_capacity; }
 
     // NB: It is illegal to call push_back/push_front/insert with a reference pointing inside the ImVector data itself! e.g. v.push_back(v[10]) is forbidden.
@@ -1473,9 +1490,9 @@ struct ImGuiIO
     // Optional: Platform/Renderer back-end name (informational only! will be displayed in About Window) + User data for back-end/wrappers to store their own stuff.
     const char* BackendPlatformName;            // = NULL
     const char* BackendRendererName;            // = NULL
-    void*       BackendPlatformUserData;        // = NULL
-    void*       BackendRendererUserData;        // = NULL
-    void*       BackendLanguageUserData;        // = NULL
+    void*       BackendPlatformUserData;        // = NULL           // User data for platform back-end
+    void*       BackendRendererUserData;        // = NULL           // User data for renderer back-end
+    void*       BackendLanguageUserData;        // = NULL           // User data for non C++ programming language back-end
 
     // Optional: Access OS clipboard
     // (default to use native Win32 clipboard on Windows, otherwise uses a private clipboard. Override to access OS clipboard on other architectures)
@@ -1533,7 +1550,7 @@ struct ImGuiIO
     ImVec2      MouseDelta;                     // Mouse delta. Note that this is zero if either current or previous position are invalid (-FLT_MAX,-FLT_MAX), so a disappearing/reappearing mouse won't have a huge delta.
 
     //------------------------------------------------------------------
-    // [Internal] ImGui will maintain those fields. Forward compatibility not guaranteed!
+    // [Internal] Dear ImGui will maintain those fields. Forward compatibility not guaranteed!
     //------------------------------------------------------------------
 
     ImVec2      MousePosPrev;                   // Previous mouse position (note that MouseDelta is not necessary == MousePos-MousePosPrev, in case either position is invalid)
@@ -1606,15 +1623,20 @@ struct ImGuiSizeCallbackData
     ImVec2  DesiredSize;    // Read-write.  Desired size, based on user's mouse position. Write to this field to restrain resizing.
 };
 
-// [BETA] Rarely used / very advanced uses only. Use with SetNextWindowClass() and DockSpace() functions.
-// Provide hints to the platform back-end via altered viewport flags (enable/disable OS decoration, OS task bar icons, etc.) and OS level parent/child relationships.
+// [ALPHA] Rarely used / very advanced uses only. Use with SetNextWindowClass() and DockSpace() functions.
+// Important: the content of this class is still highly WIP and likely to change and be refactored
+// before we stabilize Docking features. Please be mindful if using this.
+// Provide hints:
+// - To the platform back-end via altered viewport flags (enable/disable OS decoration, OS task bar icons, etc.) 
+// - To the platform back-end for OS level parent/child relationships of viewport.
+// - To the docking system for various options and filtering.
 struct ImGuiWindowClass
 {
-    ImGuiID             ClassId;                    // User data. 0 = Default class (unclassed)
+    ImGuiID             ClassId;                    // User data. 0 = Default class (unclassed). Windows of different classes cannot be docked with each others.
     ImGuiID             ParentViewportId;           // Hint for the platform back-end. If non-zero, the platform back-end can create a parent<>child relationship between the platform windows. Not conforming back-ends are free to e.g. parent every viewport to the main viewport or not.
     ImGuiViewportFlags  ViewportFlagsOverrideSet;   // Viewport flags to set when a window of this class owns a viewport. This allows you to enforce OS decoration or task bar icon, override the defaults on a per-window basis.
     ImGuiViewportFlags  ViewportFlagsOverrideClear; // Viewport flags to clear when a window of this class owns a viewport. This allows you to enforce OS decoration or task bar icon, override the defaults on a per-window basis.
-    bool                DockingAlwaysTabBar;        // Set to true to enforce windows of this class always having their own tab (equivalent of setting the global io.ConfigDockingAlwaysTabBar)
+    bool                DockingAlwaysTabBar;        // Set to true to enforce single floating windows of this class always having their own docking node (equivalent of setting the global io.ConfigDockingAlwaysTabBar)
     bool                DockingAllowUnclassed;      // Set to true to allow windows of this class to be docked/merged with an unclassed window.
 
     ImGuiWindowClass() { ClassId = 0; ParentViewportId = 0; ViewportFlagsOverrideSet = ViewportFlagsOverrideClear = 0x00; DockingAlwaysTabBar = false; DockingAllowUnclassed = true; }
@@ -1671,12 +1693,6 @@ namespace ImGui
     static inline bool  IsAnyWindowFocused()                  { return IsWindowFocused(ImGuiFocusedFlags_AnyWindow); }
     static inline bool  IsAnyWindowHovered()                  { return IsWindowHovered(ImGuiHoveredFlags_AnyWindow); }
     static inline ImVec2 CalcItemRectClosestPoint(const ImVec2& pos, bool on_edge = false, float outward = 0.f) { IM_UNUSED(on_edge); IM_UNUSED(outward); IM_ASSERT(0); return pos; }
-    // OBSOLETED in 1.53 (between Oct 2017 and Dec 2017)
-    static inline void  ShowTestWindow()                      { return ShowDemoWindow(); }
-    static inline bool  IsRootWindowFocused()                 { return IsWindowFocused(ImGuiFocusedFlags_RootWindow); }
-    static inline bool  IsRootWindowOrAnyChildFocused()       { return IsWindowFocused(ImGuiFocusedFlags_RootAndChildWindows); }
-    static inline void  SetNextWindowContentWidth(float w)    { SetNextWindowContentSize(ImVec2(w, 0.0f)); }
-    static inline float GetItemsLineHeightWithSpacing()       { return GetFrameHeightWithSpacing(); }
 }
 typedef ImGuiInputTextCallback      ImGuiTextEditCallback;    // OBSOLETED in 1.63 (from Aug 2018): made the names consistent
 typedef ImGuiInputTextCallbackData  ImGuiTextEditCallbackData;
@@ -1808,9 +1824,13 @@ struct ImGuiStorage
 // - Step 3: the clipper validate that we have reached the expected Y position (corresponding to element DisplayEnd), advance the cursor to the end of the list and then returns 'false' to end the loop.
 struct ImGuiListClipper
 {
-    float   StartPosY;
+    int     DisplayStart, DisplayEnd;
+    int     ItemsCount;
+
+    // [Internal]
+    int     StepNo;
     float   ItemsHeight;
-    int     ItemsCount, StepNo, DisplayStart, DisplayEnd;
+    float   StartPosY;
 
     // items_count:  Use -1 to ignore (you can call Begin later). Use INT_MAX if you don't know how many items you have (in which case the cursor won't be advanced in the final step).
     // items_height: Use -1.0f to be calculated automatically on first step. Otherwise pass in the distance between your items, typically GetTextLineHeightWithSpacing() or GetFrameHeightWithSpacing().
@@ -1823,7 +1843,7 @@ struct ImGuiListClipper
     IMGUI_API void End();                                               // Automatically called on the last call of Step() that returns false.
 };
 
-// Helpers macros to generate 32-bits encoded colors
+// Helpers macros to generate 32-bit encoded colors
 #ifdef IMGUI_USE_BGRA_PACKED_COLOR
 #define IM_COL32_R_SHIFT    16
 #define IM_COL32_G_SHIFT    8
@@ -1887,13 +1907,13 @@ typedef void (*ImDrawCallback)(const ImDrawList* parent_list, const ImDrawCmd* c
 
 // Typically, 1 command = 1 GPU draw call (unless command is a callback)
 // Pre 1.71 back-ends will typically ignore the VtxOffset/IdxOffset fields. When 'io.BackendFlags & ImGuiBackendFlags_RendererHasVtxOffset'
-// is enabled, those fields allow us to render meshes larger than 64K vertices while keeping 16-bits indices.
+// is enabled, those fields allow us to render meshes larger than 64K vertices while keeping 16-bit indices.
 struct ImDrawCmd
 {
     unsigned int    ElemCount;              // Number of indices (multiple of 3) to be rendered as triangles. Vertices are stored in the callee ImDrawList's vtx_buffer[] array, indices in idx_buffer[].
     ImVec4          ClipRect;               // Clipping rectangle (x1, y1, x2, y2). Subtract ImDrawData->DisplayPos to get clipping rectangle in "viewport" coordinates
     ImTextureID     TextureId;              // User-provided texture ID. Set by user in ImfontAtlas::SetTexID() for fonts or passed to Image*() functions. Ignore if never using images or multiple fonts atlas.
-    unsigned int    VtxOffset;              // Start offset in vertex buffer. Pre-1.71 or without ImGuiBackendFlags_RendererHasVtxOffset: always 0. With ImGuiBackendFlags_RendererHasVtxOffset: may be >0 to support meshes larger than 64K vertices with 16-bits indices.
+    unsigned int    VtxOffset;              // Start offset in vertex buffer. Pre-1.71 or without ImGuiBackendFlags_RendererHasVtxOffset: always 0. With ImGuiBackendFlags_RendererHasVtxOffset: may be >0 to support meshes larger than 64K vertices with 16-bit indices.
     unsigned int    IdxOffset;              // Start offset in index buffer. Always equal to sum of ElemCount drawn so far.
     ImDrawCallback  UserCallback;           // If != NULL, call the function instead of rendering the vertices. clip_rect and texture_id will be set normally.
     void*           UserCallbackData;       // The draw callback code can access this.
@@ -1902,8 +1922,8 @@ struct ImDrawCmd
 };
 
 // Vertex index
-// (to allow large meshes with 16-bits indices: set 'io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset' and handle ImDrawCmd::VtxOffset in the renderer back-end)
-// (to use 32-bits indices: override with '#define ImDrawIdx unsigned int' in imconfig.h)
+// (to allow large meshes with 16-bit indices: set 'io.BackendFlags |= ImGuiBackendFlags_RendererHasVtxOffset' and handle ImDrawCmd::VtxOffset in the renderer back-end)
+// (to use 32-bit indices: override with '#define ImDrawIdx unsigned int' in imconfig.h)
 #ifndef ImDrawIdx
 typedef unsigned short ImDrawIdx;
 #endif
@@ -2012,7 +2032,7 @@ struct ImDrawList
     // Primitives
     // - For rectangular primitives, "p_min" and "p_max" represent the upper-left and lower-right corners.
     IMGUI_API void  AddLine(const ImVec2& p1, const ImVec2& p2, ImU32 col, float thickness = 1.0f);
-    IMGUI_API void  AddRect(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding = 0.0f, ImDrawCornerFlags rounding_corners = ImDrawCornerFlags_All, float thickness = 1.0f);   // a: upper-left, b: lower-right (== upper-left + size), rounding_corners_flags: 4-bits corresponding to which corner to round
+    IMGUI_API void  AddRect(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding = 0.0f, ImDrawCornerFlags rounding_corners = ImDrawCornerFlags_All, float thickness = 1.0f);   // a: upper-left, b: lower-right (== upper-left + size), rounding_corners_flags: 4 bits corresponding to which corner to round
     IMGUI_API void  AddRectFilled(const ImVec2& p_min, const ImVec2& p_max, ImU32 col, float rounding = 0.0f, ImDrawCornerFlags rounding_corners = ImDrawCornerFlags_All);                     // a: upper-left, b: lower-right (== upper-left + size)
     IMGUI_API void  AddRectFilledMultiColor(const ImVec2& p_min, const ImVec2& p_max, ImU32 col_upr_left, ImU32 col_upr_right, ImU32 col_bot_right, ImU32 col_bot_left);
     IMGUI_API void  AddQuad(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, ImU32 col, float thickness = 1.0f);
@@ -2021,11 +2041,13 @@ struct ImDrawList
     IMGUI_API void  AddTriangleFilled(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, ImU32 col);
     IMGUI_API void  AddCircle(const ImVec2& center, float radius, ImU32 col, int num_segments = 12, float thickness = 1.0f);
     IMGUI_API void  AddCircleFilled(const ImVec2& center, float radius, ImU32 col, int num_segments = 12);
+    IMGUI_API void  AddNgon(const ImVec2& center, float radius, ImU32 col, int num_segments, float thickness = 1.0f);
+    IMGUI_API void  AddNgonFilled(const ImVec2& center, float radius, ImU32 col, int num_segments);
     IMGUI_API void  AddText(const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end = NULL);
     IMGUI_API void  AddText(const ImFont* font, float font_size, const ImVec2& pos, ImU32 col, const char* text_begin, const char* text_end = NULL, float wrap_width = 0.0f, const ImVec4* cpu_fine_clip_rect = NULL);
     IMGUI_API void  AddPolyline(const ImVec2* points, int num_points, ImU32 col, bool closed, float thickness);
     IMGUI_API void  AddConvexPolyFilled(const ImVec2* points, int num_points, ImU32 col); // Note: Anti-aliased filling requires points to be in clockwise order.
-    IMGUI_API void  AddBezierCurve(const ImVec2& pos0, const ImVec2& cp0, const ImVec2& cp1, const ImVec2& pos1, ImU32 col, float thickness, int num_segments = 0);
+    IMGUI_API void  AddBezierCurve(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, ImU32 col, float thickness, int num_segments = 0);
 
     // Image primitives
     // - Read FAQ to understand what ImTextureID is.
@@ -2043,7 +2065,7 @@ struct ImDrawList
     inline    void  PathStroke(ImU32 col, bool closed, float thickness = 1.0f)  { AddPolyline(_Path.Data, _Path.Size, col, closed, thickness); _Path.Size = 0; }
     IMGUI_API void  PathArcTo(const ImVec2& center, float radius, float a_min, float a_max, int num_segments = 10);
     IMGUI_API void  PathArcToFast(const ImVec2& center, float radius, int a_min_of_12, int a_max_of_12);                                            // Use precomputed angles for a 12 steps circle
-    IMGUI_API void  PathBezierCurveTo(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, int num_segments = 0);
+    IMGUI_API void  PathBezierCurveTo(const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, int num_segments = 0);
     IMGUI_API void  PathRect(const ImVec2& rect_min, const ImVec2& rect_max, float rounding = 0.0f, ImDrawCornerFlags rounding_corners = ImDrawCornerFlags_All);
 
     // Advanced
@@ -2063,6 +2085,7 @@ struct ImDrawList
     IMGUI_API void  Clear();
     IMGUI_API void  ClearFreeMemory();
     IMGUI_API void  PrimReserve(int idx_count, int vtx_count);
+    IMGUI_API void  PrimUnreserve(int idx_count, int vtx_count);
     IMGUI_API void  PrimRect(const ImVec2& a, const ImVec2& b, ImU32 col);      // Axis aligned rectangle (composed of two triangles)
     IMGUI_API void  PrimRectUV(const ImVec2& a, const ImVec2& b, const ImVec2& uv_a, const ImVec2& uv_b, ImU32 col);
     IMGUI_API void  PrimQuadUV(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& d, const ImVec2& uv_a, const ImVec2& uv_b, const ImVec2& uv_c, const ImVec2& uv_d, ImU32 col);
@@ -2142,7 +2165,7 @@ struct ImFontGlyphRangesBuilder
     ImVector<ImU32> UsedChars;            // Store 1-bit per Unicode code point (0=unused, 1=used)
 
     ImFontGlyphRangesBuilder()          { Clear(); }
-    inline void     Clear()             { int size_in_bytes = 0x10000 / 8; UsedChars.resize(size_in_bytes / (int)sizeof(ImU32)); memset(UsedChars.Data, 0, (size_t)size_in_bytes); }
+    inline void     Clear()             { int size_in_bytes = (IM_UNICODE_CODEPOINT_MAX+1) / 8; UsedChars.resize(size_in_bytes / (int)sizeof(ImU32)); memset(UsedChars.Data, 0, (size_t)size_in_bytes); }
     inline bool     GetBit(int n) const { int off = (n >> 5); ImU32 mask = 1u << (n & 31); return (UsedChars[off] & mask) != 0; }  // Get bit n in the array
     inline void     SetBit(int n)       { int off = (n >> 5); ImU32 mask = 1u << (n & 31); UsedChars[off] |= mask; }               // Set bit n in the array
     inline void     AddChar(ImWchar c)  { SetBit(c); }                          // Add character
@@ -2154,12 +2177,12 @@ struct ImFontGlyphRangesBuilder
 // See ImFontAtlas::AddCustomRectXXX functions.
 struct ImFontAtlasCustomRect
 {
-    unsigned int    ID;             // Input    // User ID. Use <0x10000 to map into a font glyph, >=0x10000 for other/internal/custom texture data.
+    unsigned int    ID;             // Input    // User ID. Use < 0x110000 to map into a font glyph, >= 0x110000 for other/internal/custom texture data.
     unsigned short  Width, Height;  // Input    // Desired rectangle dimension
     unsigned short  X, Y;           // Output   // Packed position in Atlas
-    float           GlyphAdvanceX;  // Input    // For custom font glyphs only (ID<0x10000): glyph xadvance
-    ImVec2          GlyphOffset;    // Input    // For custom font glyphs only (ID<0x10000): glyph display offset
-    ImFont*         Font;           // Input    // For custom font glyphs only (ID<0x10000): target font
+    float           GlyphAdvanceX;  // Input    // For custom font glyphs only (ID < 0x110000): glyph xadvance
+    ImVec2          GlyphOffset;    // Input    // For custom font glyphs only (ID < 0x110000): glyph display offset
+    ImFont*         Font;           // Input    // For custom font glyphs only (ID < 0x110000): target font
     ImFontAtlasCustomRect()         { ID = 0xFFFFFFFF; Width = Height = 0; X = Y = 0xFFFF; GlyphAdvanceX = 0.0f; GlyphOffset = ImVec2(0,0); Font = NULL; }
     bool IsPacked() const           { return X != 0xFFFF; }
 };
@@ -2238,9 +2261,9 @@ struct ImFontAtlas
     // After calling Build(), you can query the rectangle position and render your pixels.
     // You can also request your rectangles to be mapped as font glyph (given a font + Unicode point),
     // so you can render e.g. custom colorful icons and use them as regular glyphs.
-    // Read misc/fonts/README.txt for more details about using colorful icons.
-    IMGUI_API int               AddCustomRectRegular(unsigned int id, int width, int height);                                                                   // Id needs to be >= 0x10000. Id >= 0x80000000 are reserved for ImGui and ImDrawList
-    IMGUI_API int               AddCustomRectFontGlyph(ImFont* font, ImWchar id, int width, int height, float advance_x, const ImVec2& offset = ImVec2(0,0));   // Id needs to be < 0x10000 to register a rectangle to map into a specific font.
+    // Read docs/FONTS.txt for more details about using colorful icons.
+    IMGUI_API int               AddCustomRectRegular(unsigned int id, int width, int height);                                                                   // Id needs to be >= 0x110000. Id >= 0x80000000 are reserved for ImGui and ImDrawList
+    IMGUI_API int               AddCustomRectFontGlyph(ImFont* font, ImWchar id, int width, int height, float advance_x, const ImVec2& offset = ImVec2(0,0));   // Id needs to be < 0x110000 to register a rectangle to map into a specific font.
     const ImFontAtlasCustomRect*GetCustomRectByIndex(int index) const { if (index < 0) return NULL; return &CustomRects[index]; }
 
     // [Internal]

3rdparty/ocornut-imgui/imgui_demo.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.74 WIP
+// dear imgui, v1.75 WIP
 // (demo code)
 
 // Message to the person tempted to delete this file when integrating Dear ImGui into their code base:
@@ -116,10 +116,6 @@ Index of this file:
 // [SECTION] Forward Declarations, Helpers
 //-----------------------------------------------------------------------------
 
-#if !defined(IMGUI_DISABLE_OBSOLETE_FUNCTIONS) && defined(IMGUI_DISABLE_TEST_WINDOWS) && !defined(IMGUI_DISABLE_DEMO_WINDOWS)   // Obsolete name since 1.53, TEST->DEMO
-#define IMGUI_DISABLE_DEMO_WINDOWS
-#endif
-
 #if !defined(IMGUI_DISABLE_DEMO_WINDOWS)
 
 // Forward Declarations
@@ -139,7 +135,7 @@ static void ShowExampleAppCustomRendering(bool* p_open);
 static void ShowExampleMenuFile();
 
 // Helper to display a little (?) mark which shows a tooltip when hovered.
-// In your own code you may want to display an actual icon if you are using a merged icon fonts (see misc/fonts/README.txt)
+// In your own code you may want to display an actual icon if you are using a merged icon fonts (see docs/FONTS.txt)
 static void HelpMarker(const char* desc)
 {
     ImGui::TextDisabled("(?)");
@@ -169,25 +165,28 @@ void ImGui::ShowUserGuide()
     ImGuiIO& io = ImGui::GetIO();
     ImGui::BulletText("Double-click on title bar to collapse window.");
     ImGui::BulletText("Click and drag on lower corner to resize window\n(double-click to auto fit window to its contents).");
-    if (io.ConfigWindowsMoveFromTitleBarOnly)
-        ImGui::BulletText("Click and drag on title bar to move window.");
-    else
-        ImGui::BulletText("Click and drag on any empty space to move window.");
-    ImGui::BulletText("TAB/SHIFT+TAB to cycle through keyboard editable fields.");
     ImGui::BulletText("CTRL+Click on a slider or drag box to input value as text.");
+    ImGui::BulletText("TAB/SHIFT+TAB to cycle through keyboard editable fields.");
     if (io.FontAllowUserScaling)
         ImGui::BulletText("CTRL+Mouse Wheel to zoom window contents.");
-    ImGui::BulletText("Mouse Wheel to scroll.");
-    ImGui::BulletText("While editing text:\n");
+    ImGui::BulletText("While inputing text:\n");
     ImGui::Indent();
-    ImGui::BulletText("Hold SHIFT or use mouse to select text.");
     ImGui::BulletText("CTRL+Left/Right to word jump.");
     ImGui::BulletText("CTRL+A or double-click to select all.");
-    ImGui::BulletText("CTRL+X,CTRL+C,CTRL+V to use clipboard.");
+    ImGui::BulletText("CTRL+X/C/V to use clipboard cut/copy/paste.");
     ImGui::BulletText("CTRL+Z,CTRL+Y to undo/redo.");
     ImGui::BulletText("ESCAPE to revert.");
     ImGui::BulletText("You can apply arithmetic operators +,*,/ on numerical values.\nUse +- to subtract.");
     ImGui::Unindent();
+    ImGui::BulletText("With keyboard navigation enabled:");
+    ImGui::Indent();
+    ImGui::BulletText("Arrow keys to navigate.");
+    ImGui::BulletText("Space to activate a widget.");
+    ImGui::BulletText("Return to input text into a widget.");
+    ImGui::BulletText("Escape to deactivate a widget, close popup, exit child window.");
+    ImGui::BulletText("Alt to jump to the menu layer of a window.");
+    ImGui::BulletText("CTRL+Tab to select a window.");
+    ImGui::Unindent();
 }
 
 //-----------------------------------------------------------------------------
@@ -334,12 +333,20 @@ void ImGui::ShowDemoWindow(bool* p_open)
 
     if (ImGui::CollapsingHeader("Help"))
     {
+        ImGui::Text("ABOUT THIS DEMO:");
+        ImGui::BulletText("Sections below are demonstrating many aspects of the library.");
+        ImGui::BulletText("The \"Examples\" menu above leads to more demo contents.");
+        ImGui::BulletText("The \"Tools\" menu above gives access to: About Box, Style Editor,\n"
+                          "and Metrics (general purpose Dear ImGui debugging tool).");
+        ImGui::Separator();
+
         ImGui::Text("PROGRAMMER GUIDE:");
-        ImGui::BulletText("Please see the ShowDemoWindow() code in imgui_demo.cpp. <- you are here!");
-        ImGui::BulletText("Please see the comments in imgui.cpp.");
-        ImGui::BulletText("Please see the examples/ application.");
-        ImGui::BulletText("Enable 'io.ConfigFlags |= NavEnableKeyboard' for keyboard controls.");
-        ImGui::BulletText("Enable 'io.ConfigFlags |= NavEnableGamepad' for gamepad controls.");
+        ImGui::BulletText("See the ShowDemoWindow() code in imgui_demo.cpp. <- you are here!");
+        ImGui::BulletText("See comments in imgui.cpp.");
+        ImGui::BulletText("See example applications in the examples/ folder.");
+        ImGui::BulletText("Read the FAQ at http://www.dearimgui.org/faq/");
+        ImGui::BulletText("Set 'io.ConfigFlags |= NavEnableKeyboard' for keyboard controls.");
+        ImGui::BulletText("Set 'io.ConfigFlags |= NavEnableGamepad' for gamepad controls.");
         ImGui::Separator();
 
         ImGui::Text("USER GUIDE:");
@@ -416,7 +423,7 @@ void ImGui::ShowDemoWindow(bool* p_open)
 
         if (ImGui::TreeNode("Backend Flags"))
         {
-            HelpMarker("Those flags are set by the back-ends (imgui_impl_xxx files) to specify their capabilities.");
+            HelpMarker("Those flags are set by the back-ends (imgui_impl_xxx files) to specify their capabilities.\nHere we expose then as read-only fields to avoid breaking interactions with your back-end.");
             ImGuiBackendFlags backend_flags = io.BackendFlags; // Make a local copy to avoid modifying actual back-end flags.
             ImGui::CheckboxFlags("io.BackendFlags: HasGamepad", (unsigned int *)&backend_flags, ImGuiBackendFlags_HasGamepad);
             ImGui::CheckboxFlags("io.BackendFlags: HasMouseCursors", (unsigned int *)&backend_flags, ImGuiBackendFlags_HasMouseCursors);
@@ -431,6 +438,7 @@ void ImGui::ShowDemoWindow(bool* p_open)
 
         if (ImGui::TreeNode("Style"))
         {
+            HelpMarker("The same contents can be accessed in 'Tools->Style Editor' or by calling the ShowStyleEditor() function.");
             ImGui::ShowStyleEditor();
             ImGui::TreePop();
             ImGui::Separator();
@@ -561,6 +569,8 @@ static void ShowDemoWindowWidgets()
         }
 
         {
+            // To wire InputText() with std::string or any other custom string type,
+            // see the "Text Input > Resize Callback" section of this demo, and the misc/cpp/imgui_stdlib.h file.
             static char str0[128] = "Hello, world!";
             ImGui::InputText("input text", str0, IM_ARRAYSIZE(str0));
             ImGui::SameLine(); HelpMarker("USER:\nHold SHIFT or use mouse to select text.\n" "CTRL+Left/Right to word jump.\n" "CTRL+A or double-click to select all.\n" "CTRL+X,CTRL+C,CTRL+V clipboard.\n" "CTRL+Z,CTRL+Y undo/redo.\n" "ESCAPE to revert.\n\nPROGRAMMER:\nYou can use the ImGuiInputTextFlags_CallbackResize facility if you need to wire InputText() to a dynamic string type. See misc/cpp/imgui_stdlib.h for an example (this is not demonstrated in imgui_demo.cpp).");
@@ -813,14 +823,14 @@ static void ShowDemoWindowWidgets()
         if (ImGui::TreeNode("UTF-8 Text"))
         {
             // UTF-8 test with Japanese characters
-            // (Needs a suitable font, try Noto, or Arial Unicode, or M+ fonts. Read misc/fonts/README.txt for details.)
+            // (Needs a suitable font, try Noto, or Arial Unicode, or M+ fonts. Read docs/FONTS.txt for details.)
             // - From C++11 you can use the u8"my text" syntax to encode literal strings as UTF-8
             // - For earlier compiler, you may be able to encode your sources as UTF-8 (e.g. Visual Studio save your file as 'UTF-8 without signature')
             // - FOR THIS DEMO FILE ONLY, BECAUSE WE WANT TO SUPPORT OLD COMPILERS, WE ARE *NOT* INCLUDING RAW UTF-8 CHARACTERS IN THIS SOURCE FILE.
             //   Instead we are encoding a few strings with hexadecimal constants. Don't do this in your application!
             //   Please use u8"text in any language" in your application!
             // Note that characters values are preserved even by InputText() if the font cannot be displayed, so you can safely copy & paste garbled characters into another application.
-            ImGui::TextWrapped("CJK text will only appears if the font was loaded with the appropriate CJK character ranges. Call io.Font->AddFontFromFileTTF() manually to load extra character ranges. Read misc/fonts/README.txt for details.");
+            ImGui::TextWrapped("CJK text will only appears if the font was loaded with the appropriate CJK character ranges. Call io.Font->AddFontFromFileTTF() manually to load extra character ranges. Read docs/FONTS.txt for details.");
             ImGui::Text("Hiragana: \xe3\x81\x8b\xe3\x81\x8d\xe3\x81\x8f\xe3\x81\x91\xe3\x81\x93 (kakikukeko)"); // Normally we would use u8"blah blah" with the proper characters directly in the string.
             ImGui::Text("Kanjis: \xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e (nihongo)");
             static char buf[32] = "\xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e";
@@ -1036,6 +1046,8 @@ static void ShowDemoWindowWidgets()
         ImGui::TreePop();
     }
 
+    // To wire InputText() with std::string or any other custom string type,
+    // see the "Text Input > Resize Callback" section of this demo, and the misc/cpp/imgui_stdlib.h file.
     if (ImGui::TreeNode("Text Input"))
     {
         if (ImGui::TreeNode("Multi-line Text Input"))
@@ -1055,7 +1067,7 @@ static void ShowDemoWindowWidgets()
                 "\tlock cmpxchg8b eax\n";
 
             static ImGuiInputTextFlags flags = ImGuiInputTextFlags_AllowTabInput;
-            HelpMarker("You can use the ImGuiInputTextFlags_CallbackResize facility if you need to wire InputTextMultiline() to a dynamic string type. See misc/cpp/imgui_stdlib.h for an example. (This is not demonstrated in imgui_demo.cpp)");
+            HelpMarker("You can use the ImGuiInputTextFlags_CallbackResize facility if you need to wire InputTextMultiline() to a dynamic string type. See misc/cpp/imgui_stdlib.h for an example. (This is not demonstrated in imgui_demo.cpp because we don't want to include <string> in here)");
             ImGui::CheckboxFlags("ImGuiInputTextFlags_ReadOnly", (unsigned int*)&flags, ImGuiInputTextFlags_ReadOnly);
             ImGui::CheckboxFlags("ImGuiInputTextFlags_AllowTabInput", (unsigned int*)&flags, ImGuiInputTextFlags_AllowTabInput);
             ImGui::CheckboxFlags("ImGuiInputTextFlags_CtrlEnterForNewLine", (unsigned int*)&flags, ImGuiInputTextFlags_CtrlEnterForNewLine);
@@ -1084,8 +1096,9 @@ static void ShowDemoWindowWidgets()
 
         if (ImGui::TreeNode("Resize Callback"))
         {
-            // If you have a custom string type you would typically create a ImGui::InputText() wrapper than takes your type as input.
-            // See misc/cpp/imgui_stdlib.h and .cpp for an implementation of this using std::string.
+            // To wire InputText() with std::string or any other custom string type,
+            // you can use the ImGuiInputTextFlags_CallbackResize flag + create a custom ImGui::InputText() wrapper using your prefered type.
+            // See misc/cpp/imgui_stdlib.h for an implementation of this using std::string.
             HelpMarker("Demonstrate using ImGuiInputTextFlags_CallbackResize to wire your resizable string type to InputText().\n\nSee misc/cpp/imgui_stdlib.h for an implementation of this for std::string.");
             struct Funcs
             {
@@ -2073,7 +2086,7 @@ static void ShowDemoWindowLayout()
             if (ImGui::BeginTabBar("MyTabBar", tab_bar_flags))
             {
                 for (int n = 0; n < IM_ARRAYSIZE(opened); n++)
-                    if (opened[n] && ImGui::BeginTabItem(names[n], &opened[n]))
+                    if (opened[n] && ImGui::BeginTabItem(names[n], &opened[n], ImGuiTabItemFlags_None))
                     {
                         ImGui::Text("This is the %s tab!", names[n]);
                         if (n & 1)
@@ -2251,10 +2264,10 @@ static void ShowDemoWindowLayout()
         ImGui::SameLine(140); enable_track |= ImGui::DragInt("##item", &track_item, 0.25f, 0, 99, "Item = %d");
 
         bool scroll_to_off = ImGui::Button("Scroll Offset");
-        ImGui::SameLine(140); scroll_to_off |= ImGui::DragFloat("##off", &scroll_to_off_px, 1.00f, 0, 9999, "+%.0f px");
+        ImGui::SameLine(140); scroll_to_off |= ImGui::DragFloat("##off", &scroll_to_off_px, 1.00f, 0, FLT_MAX, "+%.0f px");
 
         bool scroll_to_pos = ImGui::Button("Scroll To Pos");
-        ImGui::SameLine(140); scroll_to_pos |= ImGui::DragFloat("##pos", &scroll_to_pos_px, 1.00f, -10, 9999, "X/Y = %.0f px");
+        ImGui::SameLine(140); scroll_to_pos |= ImGui::DragFloat("##pos", &scroll_to_pos_px, 1.00f, -10, FLT_MAX, "X/Y = %.0f px");
         ImGui::PopItemWidth();
 
         if (scroll_to_off || scroll_to_pos)
@@ -2491,7 +2504,7 @@ static void ShowDemoWindowLayout()
         ImVec2 pos = ImGui::GetCursorScreenPos();
         ImVec4 clip_rect(pos.x, pos.y, pos.x + size.x, pos.y + size.y);
         ImGui::InvisibleButton("##dummy", size);
-        if (ImGui::IsItemActive() && ImGui::IsMouseDragging()) { offset.x += ImGui::GetIO().MouseDelta.x; offset.y += ImGui::GetIO().MouseDelta.y; }
+        if (ImGui::IsItemActive() && ImGui::IsMouseDragging(0)) { offset.x += ImGui::GetIO().MouseDelta.x; offset.y += ImGui::GetIO().MouseDelta.y; }
         ImGui::GetWindowDrawList()->AddRectFilled(pos, ImVec2(pos.x + size.x, pos.y + size.y), IM_COL32(90, 90, 120, 255));
         ImGui::GetWindowDrawList()->AddText(ImGui::GetFont(), ImGui::GetFontSize()*2.0f, ImVec2(pos.x + offset.x, pos.y + offset.y), IM_COL32(255, 255, 255, 255), "Line 1 hello\nLine 2 clip me!", NULL, 0.0f, &clip_rect);
         ImGui::TreePop();
@@ -3097,7 +3110,7 @@ static void ShowDemoWindowMisc()
 
         if (ImGui::TreeNode("Mouse cursors"))
         {
-            const char* mouse_cursors_names[] = { "Arrow", "TextInput", "Move", "ResizeNS", "ResizeEW", "ResizeNESW", "ResizeNWSE", "Hand" };
+            const char* mouse_cursors_names[] = { "Arrow", "TextInput", "ResizeAll", "ResizeNS", "ResizeEW", "ResizeNESW", "ResizeNWSE", "Hand", "NotAllowed" };
             IM_ASSERT(IM_ARRAYSIZE(mouse_cursors_names) == ImGuiMouseCursor_COUNT);
 
             ImGui::Text("Current mouse cursor = %d: %s", ImGui::GetMouseCursor(), mouse_cursors_names[ImGui::GetMouseCursor()]);
@@ -3164,11 +3177,17 @@ void ImGui::ShowAboutWindow(bool* p_open)
 #ifdef IMGUI_DISABLE_WIN32_FUNCTIONS
         ImGui::Text("define: IMGUI_DISABLE_WIN32_FUNCTIONS");
 #endif
-#ifdef IMGUI_DISABLE_FORMAT_STRING_FUNCTIONS
-        ImGui::Text("define: IMGUI_DISABLE_FORMAT_STRING_FUNCTIONS");
+#ifdef IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS
+        ImGui::Text("define: IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS");
+#endif
+#ifdef IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS
+        ImGui::Text("define: IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS");
+#endif
+#ifdef IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS
+        ImGui::Text("define: IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS");
 #endif
-#ifdef IMGUI_DISABLE_MATH_FUNCTIONS
-        ImGui::Text("define: IMGUI_DISABLE_MATH_FUNCTIONS");
+#ifdef IMGUI_DISABLE_FILE_FUNCTIONS
+        ImGui::Text("define: IMGUI_DISABLE_FILE_FUNCTIONS");
 #endif
 #ifdef IMGUI_DISABLE_DEFAULT_ALLOCATORS
         ImGui::Text("define: IMGUI_DISABLE_DEFAULT_ALLOCATORS");
@@ -3316,7 +3335,7 @@ void ImGui::ShowFontSelector(const char* label)
     HelpMarker(
         "- Load additional fonts with io.Fonts->AddFontFromFileTTF().\n"
         "- The font atlas is built when calling io.Fonts->GetTexDataAsXXXX() or io.Fonts->Build().\n"
-        "- Read FAQ and documentation in misc/fonts/ for more details.\n"
+        "- Read FAQ and docs/FONTS.txt for more details.\n"
         "- If you need to add/remove fonts at runtime (e.g. for DPI change), do it before calling NewFrame().");
 }
 
@@ -3444,7 +3463,7 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
                 if (memcmp(&style.Colors[i], &ref->Colors[i], sizeof(ImVec4)) != 0)
                 {
                     // Tips: in a real user application, you may want to merge and use an icon font into the main font, so instead of "Save"/"Revert" you'd use icons.
-                    // Read the FAQ and misc/fonts/README.txt about using icon fonts. It's really easy and super convenient!
+                    // Read the FAQ and docs/FONTS.txt about using icon fonts. It's really easy and super convenient!
                     ImGui::SameLine(0.0f, style.ItemInnerSpacing.x); if (ImGui::Button("Save")) ref->Colors[i] = style.Colors[i];
                     ImGui::SameLine(0.0f, style.ItemInnerSpacing.x); if (ImGui::Button("Revert")) style.Colors[i] = ref->Colors[i];
                 }
@@ -3462,7 +3481,7 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
         {
             ImGuiIO& io = ImGui::GetIO();
             ImFontAtlas* atlas = io.Fonts;
-            HelpMarker("Read FAQ and misc/fonts/README.txt for details on font loading.");
+            HelpMarker("Read FAQ and docs/FONTS.txt for details on font loading.");
             ImGui::PushItemWidth(120);
             for (int i = 0; i < atlas->Fonts.Size; i++)
             {
@@ -3482,17 +3501,17 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
                     ImGui::Text("Fallback character: '%c' (U+%04X)", font->FallbackChar, font->FallbackChar);
                     ImGui::Text("Ellipsis character: '%c' (U+%04X)", font->EllipsisChar, font->EllipsisChar);
                     const float surface_sqrt = sqrtf((float)font->MetricsTotalSurface);
-                    ImGui::Text("Texture surface: %d pixels (approx) ~ %dx%d", font->MetricsTotalSurface, (int)surface_sqrt, (int)surface_sqrt);
+                    ImGui::Text("Texture Area: about %d px ~%dx%d px", font->MetricsTotalSurface, (int)surface_sqrt, (int)surface_sqrt);
                     for (int config_i = 0; config_i < font->ConfigDataCount; config_i++)
                         if (const ImFontConfig* cfg = &font->ConfigData[config_i])
                             ImGui::BulletText("Input %d: \'%s\', Oversample: (%d,%d), PixelSnapH: %d", config_i, cfg->Name, cfg->OversampleH, cfg->OversampleV, cfg->PixelSnapH);
                     if (ImGui::TreeNode("Glyphs", "Glyphs (%d)", font->Glyphs.Size))
                     {
                         // Display all glyphs of the fonts in separate pages of 256 characters
-                        for (int base = 0; base < 0x10000; base += 256)
+                        for (unsigned int base = 0; base <= IM_UNICODE_CODEPOINT_MAX; base += 256)
                         {
                             int count = 0;
-                            for (int n = 0; n < 256; n++)
+                            for (unsigned int n = 0; n < 256; n++)
                                 count += font->FindGlyphNoFallback((ImWchar)(base + n)) ? 1 : 0;
                             if (count > 0 && ImGui::TreeNode((void*)(intptr_t)base, "U+%04X..U+%04X (%d %s)", base, base + 255, count, count > 1 ? "glyphs" : "glyph"))
                             {
@@ -3500,7 +3519,7 @@ void ImGui::ShowStyleEditor(ImGuiStyle* ref)
                                 float cell_spacing = style.ItemSpacing.y;
                                 ImVec2 base_pos = ImGui::GetCursorScreenPos();
                                 ImDrawList* draw_list = ImGui::GetWindowDrawList();
-                                for (int n = 0; n < 256; n++)
+                                for (unsigned int n = 0; n < 256; n++)
                                 {
                                     ImVec2 cell_p1(base_pos.x + (n % 16) * (cell_size + cell_spacing), base_pos.y + (n / 16) * (cell_size + cell_spacing));
                                     ImVec2 cell_p2(cell_p1.x + cell_size, cell_p1.y + cell_size);
@@ -4510,9 +4529,11 @@ static void ShowExampleAppCustomRendering(bool* p_open)
         {
             static float sz = 36.0f;
             static float thickness = 3.0f;
+            static int ngon_sides = 6;
             static ImVec4 colf = ImVec4(1.0f, 1.0f, 0.4f, 1.0f);
             ImGui::DragFloat("Size", &sz, 0.2f, 2.0f, 72.0f, "%.0f");
             ImGui::DragFloat("Thickness", &thickness, 0.05f, 1.0f, 8.0f, "%.02f");
+            ImGui::SliderInt("n-gon sides", &ngon_sides, 3, 12);
             ImGui::ColorEdit4("Color", &colf.x);
             const ImVec2 p = ImGui::GetCursorScreenPos();
             const ImU32 col = ImColor(colf);
@@ -4525,7 +4546,7 @@ static void ShowExampleAppCustomRendering(bool* p_open)
             {
                 // First line uses a thickness of 1.0f, second line uses the configurable thickness
                 float th = (n == 0) ? 1.0f : thickness;
-                draw_list->AddCircle(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, 6, th);                x += sz + spacing;  // Hexagon
+                draw_list->AddNgon(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, ngon_sides, th);         x += sz + spacing;  // n-gon
                 draw_list->AddCircle(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, 20, th);               x += sz + spacing;  // Circle
                 draw_list->AddRect(ImVec2(x, y), ImVec2(x + sz, y + sz), col, 0.0f,  corners_none, th);     x += sz + spacing;  // Square
                 draw_list->AddRect(ImVec2(x, y), ImVec2(x + sz, y + sz), col, 10.0f, corners_all, th);      x += sz + spacing;  // Square with all rounded corners
@@ -4539,7 +4560,7 @@ static void ShowExampleAppCustomRendering(bool* p_open)
                 x = p.x + 4;
                 y += sz + spacing;
             }
-            draw_list->AddCircleFilled(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, 6);              x += sz + spacing;  // Hexagon
+            draw_list->AddNgonFilled(ImVec2(x + sz * 0.5f, y + sz * 0.5f), sz*0.5f, col, ngon_sides);   x += sz + spacing;  // n-gon
             draw_list->AddCircleFilled(ImVec2(x + sz*0.5f, y + sz*0.5f), sz*0.5f, col, 32);             x += sz + spacing;  // Circle
             draw_list->AddRectFilled(ImVec2(x, y), ImVec2(x + sz, y + sz), col);                        x += sz + spacing;  // Square
             draw_list->AddRectFilled(ImVec2(x, y), ImVec2(x + sz, y + sz), col, 10.0f);                 x += sz + spacing;  // Square with all rounded corners

3rdparty/ocornut-imgui/imgui_draw.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.74 WIP
+// dear imgui, v1.75 WIP
 // (drawing and font code)
 
 /*
@@ -522,10 +522,13 @@ void ImDrawList::PopTextureID()
     UpdateTextureID();
 }
 
-// NB: this can be called with negative count for removing primitives (as long as the result does not underflow)
+// Reserve space for a number of vertices and indices.
+// You must finish filling your reserved data before calling PrimReserve() again, as it may reallocate or
+// submit the intermediate results. PrimUnreserve() can be used to release unused allocations.
 void ImDrawList::PrimReserve(int idx_count, int vtx_count)
 {
     // Large mesh support (when enabled)
+    IM_ASSERT_PARANOID(idx_count >= 0 && vtx_count >= 0);
     if (sizeof(ImDrawIdx) == 2 && (_VtxCurrentIdx + vtx_count >= (1 << 16)) && (Flags & ImDrawListFlags_AllowVtxOffset))
     {
         _VtxCurrentOffset = VtxBuffer.Size;
@@ -533,7 +536,7 @@ void ImDrawList::PrimReserve(int idx_count, int vtx_count)
         AddDrawCmd();
     }
 
-    ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size-1];
+    ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size - 1];
     draw_cmd.ElemCount += idx_count;
 
     int vtx_buffer_old_size = VtxBuffer.Size;
@@ -545,6 +548,17 @@ void ImDrawList::PrimReserve(int idx_count, int vtx_count)
     _IdxWritePtr = IdxBuffer.Data + idx_buffer_old_size;
 }
 
+// Release the a number of reserved vertices/indices from the end of the last reservation made with PrimReserve().
+void ImDrawList::PrimUnreserve(int idx_count, int vtx_count)
+{
+    IM_ASSERT_PARANOID(idx_count >= 0 && vtx_count >= 0);
+
+    ImDrawCmd& draw_cmd = CmdBuffer.Data[CmdBuffer.Size - 1];
+    draw_cmd.ElemCount -= idx_count;
+    VtxBuffer.shrink(VtxBuffer.Size - vtx_count);
+    IdxBuffer.shrink(IdxBuffer.Size - idx_count);
+}
+
 // Fully unrolled with inline call to keep our debug builds decently fast.
 void ImDrawList::PrimRect(const ImVec2& a, const ImVec2& c, ImU32 col)
 {
@@ -899,6 +913,17 @@ void ImDrawList::PathArcTo(const ImVec2& center, float radius, float a_min, floa
     }
 }
 
+ImVec2 ImBezierCalc(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, float t)
+{
+    float u = 1.0f - t;
+    float w1 = u*u*u;
+    float w2 = 3*u*u*t;
+    float w3 = 3*u*t*t;
+    float w4 = t*t*t;
+    return ImVec2(w1*p1.x + w2*p2.x + w3*p3.x + w4*p4.x, w1*p1.y + w2*p2.y + w3*p3.y + w4*p4.y);
+}
+
+// Closely mimics BezierClosestPointCasteljauStep() in imgui.cpp
 static void PathBezierToCasteljau(ImVector<ImVec2>* path, float x1, float y1, float x2, float y2, float x3, float y3, float x4, float y4, float tess_tol, int level)
 {
     float dx = x4 - x1;
@@ -919,7 +944,6 @@ static void PathBezierToCasteljau(ImVector<ImVec2>* path, float x1, float y1, fl
         float x123 = (x12+x23)*0.5f,    y123 = (y12+y23)*0.5f;
         float x234 = (x23+x34)*0.5f,    y234 = (y23+y34)*0.5f;
         float x1234 = (x123+x234)*0.5f, y1234 = (y123+y234)*0.5f;
-
         PathBezierToCasteljau(path, x1,y1,        x12,y12,    x123,y123,  x1234,y1234, tess_tol, level+1);
         PathBezierToCasteljau(path, x1234,y1234,  x234,y234,  x34,y34,    x4,y4,       tess_tol, level+1);
     }
@@ -930,22 +954,13 @@ void ImDrawList::PathBezierCurveTo(const ImVec2& p2, const ImVec2& p3, const ImV
     ImVec2 p1 = _Path.back();
     if (num_segments == 0)
     {
-        // Auto-tessellated
-        PathBezierToCasteljau(&_Path, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, p4.x, p4.y, _Data->CurveTessellationTol, 0);
+        PathBezierToCasteljau(&_Path, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, p4.x, p4.y, _Data->CurveTessellationTol, 0); // Auto-tessellated
     }
     else
     {
         float t_step = 1.0f / (float)num_segments;
         for (int i_step = 1; i_step <= num_segments; i_step++)
-        {
-            float t = t_step * i_step;
-            float u = 1.0f - t;
-            float w1 = u*u*u;
-            float w2 = 3*u*u*t;
-            float w3 = 3*u*t*t;
-            float w4 = t*t*t;
-            _Path.push_back(ImVec2(w1*p1.x + w2*p2.x + w3*p3.x + w4*p4.x, w1*p1.y + w2*p2.y + w3*p3.y + w4*p4.y));
-        }
+            _Path.push_back(ImBezierCalc(p1, p2, p3, p4, t_step * i_step));
     }
 }
 
@@ -1096,13 +1111,38 @@ void ImDrawList::AddCircleFilled(const ImVec2& center, float radius, ImU32 col,
     PathFillConvex(col);
 }
 
-void ImDrawList::AddBezierCurve(const ImVec2& pos0, const ImVec2& cp0, const ImVec2& cp1, const ImVec2& pos1, ImU32 col, float thickness, int num_segments)
+// Guaranteed to honor 'num_segments'
+void ImDrawList::AddNgon(const ImVec2& center, float radius, ImU32 col, int num_segments, float thickness)
+{
+    if ((col & IM_COL32_A_MASK) == 0 || num_segments <= 2)
+        return;
+
+    // Because we are filling a closed shape we remove 1 from the count of segments/points
+    const float a_max = (IM_PI * 2.0f) * ((float)num_segments - 1.0f) / (float)num_segments;
+    PathArcTo(center, radius - 0.5f, 0.0f, a_max, num_segments - 1);
+    PathStroke(col, true, thickness);
+}
+
+// Guaranteed to honor 'num_segments'
+void ImDrawList::AddNgonFilled(const ImVec2& center, float radius, ImU32 col, int num_segments)
+{
+    if ((col & IM_COL32_A_MASK) == 0 || num_segments <= 2)
+        return;
+
+    // Because we are filling a closed shape we remove 1 from the count of segments/points
+    const float a_max = (IM_PI * 2.0f) * ((float)num_segments - 1.0f) / (float)num_segments;
+    PathArcTo(center, radius, 0.0f, a_max, num_segments - 1);
+    PathFillConvex(col);
+}
+
+// Cubic Bezier takes 4 controls points
+void ImDrawList::AddBezierCurve(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, ImU32 col, float thickness, int num_segments)
 {
     if ((col & IM_COL32_A_MASK) == 0)
         return;
 
-    PathLineTo(pos0);
-    PathBezierCurveTo(cp0, cp1, pos1, num_segments);
+    PathLineTo(p1);
+    PathBezierCurveTo(p2, p3, p4, num_segments);
     PathStroke(col, false, thickness);
 }
 
@@ -1281,7 +1321,7 @@ void ImDrawListSplitter::Merge(ImDrawList* draw_list)
             // Merge previous channel last draw command with current channel first draw command if matching.
             last_cmd->ElemCount += ch._CmdBuffer[0].ElemCount;
             idx_offset += ch._CmdBuffer[0].ElemCount;
-            ch._CmdBuffer.erase(ch._CmdBuffer.Data);
+            ch._CmdBuffer.erase(ch._CmdBuffer.Data); // FIXME-OPT: Improve for multiple merges.
         }
         if (ch._CmdBuffer.Size > 0)
             last_cmd = &ch._CmdBuffer.back();
@@ -1679,7 +1719,7 @@ ImFont* ImFontAtlas::AddFontFromFileTTF(const char* filename, float size_pixels,
     void* data = ImFileLoadToMemory(filename, "rb", &data_size, 0);
     if (!data)
     {
-        IM_ASSERT(0); // Could not load file.
+        IM_ASSERT_USER_ERROR(0, "Could not load font file!");
         return NULL;
     }
     ImFontConfig font_cfg = font_cfg_template ? *font_cfg_template : ImFontConfig();
@@ -1731,7 +1771,8 @@ ImFont* ImFontAtlas::AddFontFromMemoryCompressedBase85TTF(const char* compressed
 
 int ImFontAtlas::AddCustomRectRegular(unsigned int id, int width, int height)
 {
-    IM_ASSERT(id >= 0x10000);
+    // Breaking change on 2019/11/21 (1.74): ImFontAtlas::AddCustomRectRegular() now requires an ID >= 0x110000 (instead of >= 0x10000)
+    IM_ASSERT(id >= 0x110000);
     IM_ASSERT(width > 0 && width <= 0xFFFF);
     IM_ASSERT(height > 0 && height <= 0xFFFF);
     ImFontAtlasCustomRect r;
@@ -1911,7 +1952,7 @@ bool    ImFontAtlasBuildWithStbTruetype(ImFontAtlas* atlas)
             dst_tmp.GlyphsSet.Resize(dst_tmp.GlyphsHighest + 1);
 
         for (const ImWchar* src_range = src_tmp.SrcRanges; src_range[0] && src_range[1]; src_range += 2)
-            for (int codepoint = src_range[0]; codepoint <= src_range[1]; codepoint++)
+            for (unsigned int codepoint = src_range[0]; codepoint <= src_range[1]; codepoint++)
             {
                 if (dst_tmp.GlyphsSet.GetBit(codepoint))    // Don't overwrite existing glyphs. We could make this an option for MergeMode (e.g. MergeOverwrite==true)
                     continue;
@@ -2195,7 +2236,7 @@ void ImFontAtlasBuildFinish(ImFontAtlas* atlas)
     for (int i = 0; i < atlas->CustomRects.Size; i++)
     {
         const ImFontAtlasCustomRect& r = atlas->CustomRects[i];
-        if (r.Font == NULL || r.ID > 0x10000)
+        if (r.Font == NULL || r.ID >= 0x110000)
             continue;
 
         IM_ASSERT(r.Font->ContainerAtlas == atlas);
@@ -2459,7 +2500,7 @@ void ImFontGlyphRangesBuilder::AddText(const char* text, const char* text_end)
         text += c_len;
         if (c_len == 0)
             break;
-        if (c < 0x10000)
+        if (c <= IM_UNICODE_CODEPOINT_MAX)
             AddChar((ImWchar)c);
     }
 }
@@ -2473,12 +2514,12 @@ void ImFontGlyphRangesBuilder::AddRanges(const ImWchar* ranges)
 
 void ImFontGlyphRangesBuilder::BuildRanges(ImVector<ImWchar>* out_ranges)
 {
-    int max_codepoint = 0x10000;
-    for (int n = 0; n < max_codepoint; n++)
+    const int max_codepoint = IM_UNICODE_CODEPOINT_MAX;
+    for (int n = 0; n <= max_codepoint; n++)
         if (GetBit(n))
         {
             out_ranges->push_back((ImWchar)n);
-            while (n < max_codepoint - 1 && GetBit(n + 1))
+            while (n < max_codepoint && GetBit(n + 1))
                 n++;
             out_ranges->push_back((ImWchar)n);
         }
@@ -2607,7 +2648,7 @@ void ImFont::AddGlyph(ImWchar codepoint, float x0, float y0, float x1, float y1,
 void ImFont::AddRemapChar(ImWchar dst, ImWchar src, bool overwrite_dst)
 {
     IM_ASSERT(IndexLookup.Size > 0);    // Currently this can only be called AFTER the font has been built, aka after calling ImFontAtlas::GetTexDataAs*() function.
-    int index_size = IndexLookup.Size;
+    unsigned int index_size = (unsigned int)IndexLookup.Size;
 
     if (dst < index_size && IndexLookup.Data[dst] == (ImWchar)-1 && !overwrite_dst) // 'dst' already exists
         return;
@@ -3026,9 +3067,9 @@ void ImFont::RenderText(ImDrawList* draw_list, float size, ImVec2 pos, ImU32 col
         x += char_width;
     }
 
-    // Give back unused vertices
-    draw_list->VtxBuffer.resize((int)(vtx_write - draw_list->VtxBuffer.Data));
-    draw_list->IdxBuffer.resize((int)(idx_write - draw_list->IdxBuffer.Data));
+    // Give back unused vertices (clipped ones, blanks) ~ this is essentially a PrimUnreserve() action.
+    draw_list->VtxBuffer.Size = (int)(vtx_write - draw_list->VtxBuffer.Data); // Same as calling shrink()
+    draw_list->IdxBuffer.Size = (int)(idx_write - draw_list->IdxBuffer.Data);
     draw_list->CmdBuffer[draw_list->CmdBuffer.Size-1].ElemCount -= (idx_expected_size - draw_list->IdxBuffer.Size);
     draw_list->_VtxWritePtr = vtx_write;
     draw_list->_IdxWritePtr = idx_write;

3rdparty/ocornut-imgui/imgui_internal.h

@@ -1,4 +1,4 @@
-// dear imgui, v1.74 WIP
+// dear imgui, v1.75 WIP
 // (internal structures/api)
 
 // You may use this file to debug, understand or extend ImGui features but we don't provide any guarantee of forward compatibility!
@@ -31,7 +31,7 @@ Index of this file:
 #error Must include imgui.h before imgui_internal.h
 #endif
 
-#include <stdio.h>      // FILE*
+#include <stdio.h>      // FILE*, sscanf
 #include <stdlib.h>     // NULL, malloc, free, qsort, atoi, atof
 #include <math.h>       // sqrtf, fabsf, fmodf, powf, floorf, ceilf, cosf, sinf
 #include <limits.h>     // INT_MIN, INT_MAX
@@ -60,6 +60,14 @@ Index of this file:
 #pragma GCC diagnostic ignored "-Wclass-memaccess"          // [__GNUC__ >= 8] warning: 'memset/memcpy' clearing/writing an object of type 'xxxx' with no trivial copy-assignment; use assignment or value-initialization instead
 #endif
 
+// Legacy defines
+#ifdef IMGUI_DISABLE_FORMAT_STRING_FUNCTIONS                // Renamed in 1.74
+#error Use IMGUI_DISABLE_DEFAULT_FORMAT_FUNCTIONS
+#endif
+#ifdef IMGUI_DISABLE_MATH_FUNCTIONS                         // Renamed in 1.74
+#error Use IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS
+#endif
+
 //-----------------------------------------------------------------------------
 // Forward declarations
 //-----------------------------------------------------------------------------
@@ -139,52 +147,52 @@ extern IMGUI_API ImGuiContext* GImGui;  // Current implicit context pointer
 #define IMGUI_PAYLOAD_TYPE_WINDOW       "_IMWINDOW"     // Payload == ImGuiWindow*
 
 //-----------------------------------------------------------------------------
-// Generic helpers
-//-----------------------------------------------------------------------------
-// - Macros
-// - Helpers: Misc
-// - Helpers: Bit manipulation
-// - Helpers: Geometry
-// - Helpers: String, Formatting
-// - Helpers: UTF-8 <> wchar conversions
-// - Helpers: ImVec2/ImVec4 operators
-// - Helpers: Maths
-// - Helper: ImBoolVector
-// - Helper: ImPool<>
-// - Helper: ImChunkStream<>
+// Macros
 //-----------------------------------------------------------------------------
 
-// Macros
-#define IM_PI           3.14159265358979323846f
-#ifdef _WIN32
-#define IM_NEWLINE      "\r\n"   // Play it nice with Windows users (2018/05 news: Microsoft announced that Notepad will finally display Unix-style carriage returns!)
-#else
-#define IM_NEWLINE      "\n"
+// Debug Logging
+#ifndef IMGUI_DEBUG_LOG
+#define IMGUI_DEBUG_LOG(_FMT,...)       printf("[%05d] " _FMT, GImGui->FrameCount, __VA_ARGS__)
 #endif
-#define IM_TABSIZE      (4)
+#define IMGUI_DEBUG_LOG_VIEWPORT(...)   ((void)0)       // Disable log
+#define IMGUI_DEBUG_LOG_DOCKING(...)    ((void)0)       // Disable log
+//#define IMGUI_DEBUG_LOG_VIEWPORT      IMGUI_DEBUG_LOG // Enable log
+//#define IMGUI_DEBUG_LOG_DOCKING       IMGUI_DEBUG_LOG // Enable log
+
+// Static Asserts
 #if (__cplusplus >= 201100)
 #define IM_STATIC_ASSERT(_COND)         static_assert(_COND, "")
 #else
 #define IM_STATIC_ASSERT(_COND)         typedef char static_assertion_##__line__[(_COND)?1:-1]
 #endif
-#define IM_F32_TO_INT8_UNBOUND(_VAL)    ((int)((_VAL) * 255.0f + ((_VAL)>=0 ? 0.5f : -0.5f)))   // Unsaturated, for display purpose
-#define IM_F32_TO_INT8_SAT(_VAL)        ((int)(ImSaturate(_VAL) * 255.0f + 0.5f))               // Saturated, always output 0..255
-#define IM_FLOOR(_VAL)                  ((float)(int)(_VAL))                                    // ImFloor() is not inlined in MSVC debug builds
-#define IM_ROUND(_VAL)                  ((float)(int)((_VAL) + 0.5f))                           //
+
+// "Paranoid" Debug Asserts are meant to only be enabled during specific debugging/work, otherwise would slow down the code too much.
+// We currently don't have many of those so the effect is currently negligible, but onward intent to add more aggressive ones in the code.
+//#define IMGUI_DEBUG_PARANOID
+#ifdef IMGUI_DEBUG_PARANOID
+#define IM_ASSERT_PARANOID(_EXPR)       IM_ASSERT(_EXPR)
+#else
+#define IM_ASSERT_PARANOID(_EXPR)
+#endif
 
 // Error handling
-#ifndef IMGUI_USER_ERROR
-#define IMGUI_USER_ERROR(_EXPR, _MSG)   IM_ASSERT((_EXPR) && (_MSG))    // Recoverable User Error
+// Down the line in some frameworks/languages we would like to have a way to redirect those to the programmer and recover from more faults.
+#ifndef IM_ASSERT_USER_ERROR
+#define IM_ASSERT_USER_ERROR(_EXP,_MSG) IM_ASSERT((_EXP) && _MSG)   // Recoverable User Error
 #endif
 
-// Debug Logging
-#ifndef IMGUI_DEBUG_LOG
-#define IMGUI_DEBUG_LOG(_FMT,...)       printf("[%05d] " _FMT, GImGui->FrameCount, __VA_ARGS__)
+// Misc Macros
+#define IM_PI                           3.14159265358979323846f
+#ifdef _WIN32
+#define IM_NEWLINE                      "\r\n"   // Play it nice with Windows users (Update: since 2018-05, Notepad finally appears to support Unix-style carriage returns!)
+#else
+#define IM_NEWLINE                      "\n"
 #endif
-#define IMGUI_DEBUG_LOG_VIEWPORT(...)   ((void)0)       // Disable log
-#define IMGUI_DEBUG_LOG_DOCKING(...)    ((void)0)       // Disable log
-//#define IMGUI_DEBUG_LOG_VIEWPORT      IMGUI_DEBUG_LOG // Enable log
-//#define IMGUI_DEBUG_LOG_DOCKING       IMGUI_DEBUG_LOG // Enable log
+#define IM_TABSIZE                      (4)
+#define IM_F32_TO_INT8_UNBOUND(_VAL)    ((int)((_VAL) * 255.0f + ((_VAL)>=0 ? 0.5f : -0.5f)))   // Unsaturated, for display purpose
+#define IM_F32_TO_INT8_SAT(_VAL)        ((int)(ImSaturate(_VAL) * 255.0f + 0.5f))               // Saturated, always output 0..255
+#define IM_FLOOR(_VAL)                  ((float)(int)(_VAL))                                    // ImFloor() is not inlined in MSVC debug builds
+#define IM_ROUND(_VAL)                  ((float)(int)((_VAL) + 0.5f))                           //
 
 // Enforce cdecl calling convention for functions called by the standard library, in case compilation settings changed the default to e.g. __vectorcall
 #ifdef _MSC_VER
@@ -193,9 +201,24 @@ extern IMGUI_API ImGuiContext* GImGui;  // Current implicit context pointer
 #define IMGUI_CDECL
 #endif
 
+//-----------------------------------------------------------------------------
+// Generic helpers
+// Note that the ImXXX helpers functions are lower-level than ImGui functions.
+// ImGui functions or the ImGui context are never called/used from other ImXXX functions.
+//-----------------------------------------------------------------------------
+// - Helpers: Misc
+// - Helpers: Bit manipulation
+// - Helpers: String, Formatting
+// - Helpers: UTF-8 <> wchar conversions
+// - Helpers: ImVec2/ImVec4 operators
+// - Helpers: Maths
+// - Helpers: Geometry
+// - Helper: ImBoolVector
+// - Helper: ImPool<>
+// - Helper: ImChunkStream<>
+//-----------------------------------------------------------------------------
+
 // Helpers: Misc
-IMGUI_API void*         ImFileLoadToMemory(const char* filename, const char* file_open_mode, size_t* out_file_size = NULL, int padding_bytes = 0);
-IMGUI_API FILE*         ImFileOpen(const char* filename, const char* file_open_mode);
 #define ImQsort         qsort
 IMGUI_API ImU32         ImHashData(const void* data, size_t data_size, ImU32 seed = 0);
 IMGUI_API ImU32         ImHashStr(const char* data, size_t data_size = 0, ImU32 seed = 0);
@@ -207,13 +230,6 @@ static inline ImU32     ImHash(const void* data, int size, ImU32 seed = 0) { ret
 static inline bool      ImIsPowerOfTwo(int v)           { return v != 0 && (v & (v - 1)) == 0; }
 static inline int       ImUpperPowerOfTwo(int v)        { v--; v |= v >> 1; v |= v >> 2; v |= v >> 4; v |= v >> 8; v |= v >> 16; v++; return v; }
 
-// Helpers: Geometry
-IMGUI_API ImVec2        ImLineClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& p);
-IMGUI_API bool          ImTriangleContainsPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p);
-IMGUI_API ImVec2        ImTriangleClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p);
-IMGUI_API void          ImTriangleBarycentricCoords(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p, float& out_u, float& out_v, float& out_w);
-IMGUI_API ImGuiDir      ImGetDirQuadrantFromDelta(float dx, float dy);
-
 // Helpers: String, Formatting
 IMGUI_API int           ImStricmp(const char* str1, const char* str2);
 IMGUI_API int           ImStrnicmp(const char* str1, const char* str2, size_t count);
@@ -263,9 +279,35 @@ static inline ImVec4 operator-(const ImVec4& lhs, const ImVec4& rhs)
 static inline ImVec4 operator*(const ImVec4& lhs, const ImVec4& rhs)            { return ImVec4(lhs.x*rhs.x, lhs.y*rhs.y, lhs.z*rhs.z, lhs.w*rhs.w); }
 #endif
 
+// Helpers: File System
+#if defined(__EMSCRIPTEN__) && !defined(IMGUI_DISABLE_FILE_FUNCTIONS)
+#define IMGUI_DISABLE_FILE_FUNCTIONS
+#endif
+#ifdef IMGUI_DISABLE_FILE_FUNCTIONS
+#define IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS
+typedef void* ImFileHandle;
+static inline ImFileHandle  ImFileOpen(const char*, const char*)                    { return NULL; }
+static inline bool          ImFileClose(ImFileHandle)                               { return false; }
+static inline ImU64         ImFileGetSize(ImFileHandle)                             { return (ImU64)-1; }
+static inline ImU64         ImFileRead(void*, ImU64, ImU64, ImFileHandle)           { return 0; }
+static inline ImU64         ImFileWrite(const void*, ImU64, ImU64, ImFileHandle)    { return 0; }
+#endif
+
+#ifndef IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS
+typedef FILE* ImFileHandle;
+IMGUI_API ImFileHandle      ImFileOpen(const char* filename, const char* mode);
+IMGUI_API bool              ImFileClose(ImFileHandle file);
+IMGUI_API ImU64             ImFileGetSize(ImFileHandle file);
+IMGUI_API ImU64             ImFileRead(void* data, ImU64 size, ImU64 count, ImFileHandle file);
+IMGUI_API ImU64             ImFileWrite(const void* data, ImU64 size, ImU64 count, ImFileHandle file);
+#else
+#define IMGUI_DISABLE_TTY_FUNCTIONS // Can't use stdout, fflush if we are not using default file functions
+#endif
+IMGUI_API void*             ImFileLoadToMemory(const char* filename, const char* mode, size_t* out_file_size = NULL, int padding_bytes = 0);
+
 // Helpers: Maths
 // - Wrapper for standard libs functions. (Note that imgui_demo.cpp does _not_ use them to keep the code easy to copy)
-#ifndef IMGUI_DISABLE_MATH_FUNCTIONS
+#ifndef IMGUI_DISABLE_DEFAULT_MATH_FUNCTIONS
 static inline float  ImFabs(float x)                                            { return fabsf(x); }
 static inline float  ImSqrt(float x)                                            { return sqrtf(x); }
 static inline float  ImPow(float x, float y)                                    { return powf(x, y); }
@@ -308,6 +350,17 @@ static inline ImVec2 ImRotate(const ImVec2& v, float cos_a, float sin_a)
 static inline float  ImLinearSweep(float current, float target, float speed)    { if (current < target) return ImMin(current + speed, target); if (current > target) return ImMax(current - speed, target); return current; }
 static inline ImVec2 ImMul(const ImVec2& lhs, const ImVec2& rhs)                { return ImVec2(lhs.x * rhs.x, lhs.y * rhs.y); }
 
+// Helpers: Geometry
+IMGUI_API ImVec2     ImBezierCalc(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, float t);                                         // Cubic Bezier
+IMGUI_API ImVec2     ImBezierClosestPoint(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, const ImVec2& p, int num_segments);       // For curves with explicit number of segments
+IMGUI_API ImVec2     ImBezierClosestPointCasteljau(const ImVec2& p1, const ImVec2& p2, const ImVec2& p3, const ImVec2& p4, const ImVec2& p, float tess_tol);// For auto-tessellated curves you can use tess_tol = style.CurveTessellationTol
+IMGUI_API ImVec2     ImLineClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& p);
+IMGUI_API bool       ImTriangleContainsPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p);
+IMGUI_API ImVec2     ImTriangleClosestPoint(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p);
+IMGUI_API void       ImTriangleBarycentricCoords(const ImVec2& a, const ImVec2& b, const ImVec2& c, const ImVec2& p, float& out_u, float& out_v, float& out_w);
+inline float         ImTriangleArea(const ImVec2& a, const ImVec2& b, const ImVec2& c) { return ImFabs((a.x * (b.y - c.y)) + (b.x * (c.y - a.y)) + (c.x * (a.y - b.y))) * 0.5f; }
+IMGUI_API ImGuiDir   ImGetDirQuadrantFromDelta(float dx, float dy);
+
 // Helper: ImBoolVector
 // Store 1-bit per value. Note that Resize() currently clears the whole vector.
 struct IMGUI_API ImBoolVector
@@ -376,20 +429,22 @@ enum ImGuiButtonFlags_
 {
     ImGuiButtonFlags_None                   = 0,
     ImGuiButtonFlags_Repeat                 = 1 << 0,   // hold to repeat
-    ImGuiButtonFlags_PressedOnClickRelease  = 1 << 1,   // [Default] return true on click + release on same item
-    ImGuiButtonFlags_PressedOnClick         = 1 << 2,   // return true on click (default requires click+release)
-    ImGuiButtonFlags_PressedOnRelease       = 1 << 3,   // return true on release (default requires click+release)
-    ImGuiButtonFlags_PressedOnDoubleClick   = 1 << 4,   // return true on double-click (default requires click+release)
-    ImGuiButtonFlags_FlattenChildren        = 1 << 5,   // allow interactions even if a child window is overlapping
-    ImGuiButtonFlags_AllowItemOverlap       = 1 << 6,   // require previous frame HoveredId to either match id or be null before being usable, use along with SetItemAllowOverlap()
-    ImGuiButtonFlags_DontClosePopups        = 1 << 7,   // disable automatically closing parent popup on press // [UNUSED]
-    ImGuiButtonFlags_Disabled               = 1 << 8,   // disable interactions
-    ImGuiButtonFlags_AlignTextBaseLine      = 1 << 9,   // vertically align button to match text baseline - ButtonEx() only // FIXME: Should be removed and handled by SmallButton(), not possible currently because of DC.CursorPosPrevLine
-    ImGuiButtonFlags_NoKeyModifiers         = 1 << 10,  // disable mouse interaction if a key modifier is held
-    ImGuiButtonFlags_NoHoldingActiveID      = 1 << 11,  // don't set ActiveId while holding the mouse (ImGuiButtonFlags_PressedOnClick only)
-    ImGuiButtonFlags_PressedOnDragDropHold  = 1 << 12,  // press when held into while we are drag and dropping another item (used by e.g. tree nodes, collapsing headers)
-    ImGuiButtonFlags_NoNavFocus             = 1 << 13,  // don't override navigation focus when activated
-    ImGuiButtonFlags_NoHoveredOnNav         = 1 << 14   // don't report as hovered when navigated on
+    ImGuiButtonFlags_PressedOnClick         = 1 << 1,   // return true on click (mouse down event)
+    ImGuiButtonFlags_PressedOnClickRelease  = 1 << 2,   // [Default] return true on click + release on same item <-- this is what the majority of Button are using
+    ImGuiButtonFlags_PressedOnClickReleaseAnywhere = 1 << 3, // return true on click + release even if the release event is not done while hovering the item
+    ImGuiButtonFlags_PressedOnRelease       = 1 << 4,   // return true on release (default requires click+release)
+    ImGuiButtonFlags_PressedOnDoubleClick   = 1 << 5,   // return true on double-click (default requires click+release)
+    ImGuiButtonFlags_PressedOnDragDropHold  = 1 << 6,   // return true when held into while we are drag and dropping another item (used by e.g. tree nodes, collapsing headers)
+    ImGuiButtonFlags_FlattenChildren        = 1 << 7,   // allow interactions even if a child window is overlapping
+    ImGuiButtonFlags_AllowItemOverlap       = 1 << 8,   // require previous frame HoveredId to either match id or be null before being usable, use along with SetItemAllowOverlap()
+    ImGuiButtonFlags_DontClosePopups        = 1 << 9,   // disable automatically closing parent popup on press // [UNUSED]
+    ImGuiButtonFlags_Disabled               = 1 << 10,  // disable interactions
+    ImGuiButtonFlags_AlignTextBaseLine      = 1 << 11,  // vertically align button to match text baseline - ButtonEx() only // FIXME: Should be removed and handled by SmallButton(), not possible currently because of DC.CursorPosPrevLine
+    ImGuiButtonFlags_NoKeyModifiers         = 1 << 12,  // disable mouse interaction if a key modifier is held
+    ImGuiButtonFlags_NoHoldingActiveID      = 1 << 13,  // don't set ActiveId while holding the mouse (ImGuiButtonFlags_PressedOnClick only)
+    ImGuiButtonFlags_NoNavFocus             = 1 << 14,  // don't override navigation focus when activated
+    ImGuiButtonFlags_NoHoveredOnNav         = 1 << 15,  // don't report as hovered when navigated on
+    ImGuiButtonFlags_PressedOnMask_         = ImGuiButtonFlags_PressedOnClick | ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnClickReleaseAnywhere | ImGuiButtonFlags_PressedOnRelease | ImGuiButtonFlags_PressedOnDoubleClick | ImGuiButtonFlags_PressedOnDragDropHold
 };
 
 enum ImGuiSliderFlags_
@@ -464,7 +519,7 @@ enum ImGuiItemStatusFlags_
     ImGuiItemStatusFlags_HasDisplayRect     = 1 << 1,
     ImGuiItemStatusFlags_Edited             = 1 << 2,   // Value exposed by item was edited in the current frame (should match the bool return value of most widgets)
     ImGuiItemStatusFlags_ToggledSelection   = 1 << 3,   // Set when Selectable(), TreeNode() reports toggling a selection. We can't report "Selected" because reporting the change allows us to handle clipping with less issues.
-    ImGuiItemStatusFlags_ToggledOpen        = 1 << 4,   // Set when TreeNode() reports toggling their open state. 
+    ImGuiItemStatusFlags_ToggledOpen        = 1 << 4,   // Set when TreeNode() reports toggling their open state.
     ImGuiItemStatusFlags_HasDeactivated     = 1 << 5,   // Set if the widget/group is able to provide data for the ImGuiItemStatusFlags_Deactivated flag.
     ImGuiItemStatusFlags_Deactivated        = 1 << 6    // Only valid if ImGuiItemStatusFlags_HasDeactivated is set.
 
@@ -608,7 +663,7 @@ struct IMGUI_API ImRect
     ImVec2      Min;    // Upper-left
     ImVec2      Max;    // Lower-right
 
-    ImRect()                                        : Min(FLT_MAX,FLT_MAX), Max(-FLT_MAX,-FLT_MAX)  {}
+    ImRect()                                        : Min(0.0f, 0.0f), Max(0.0f, 0.0f)              {}
     ImRect(const ImVec2& min, const ImVec2& max)    : Min(min), Max(max)                            {}
     ImRect(const ImVec4& v)                         : Min(v.x, v.y), Max(v.z, v.w)                  {}
     ImRect(float x1, float y1, float x2, float y2)  : Min(x1, y1), Max(x2, y2)                      {}
@@ -817,7 +872,7 @@ struct IMGUI_API ImDrawListSharedData
     ImVec2          TexUvWhitePixel;            // UV of white pixel in the atlas
     ImFont*         Font;                       // Current/default font (optional, for simplified AddText overload)
     float           FontSize;                   // Current/default font size (optional, for simplified AddText overload)
-    float           CurveTessellationTol;
+    float           CurveTessellationTol;       // Tessellation tolerance when using PathBezierCurveTo()
     ImVec4          ClipRectFullscreen;         // Value for PushClipRectFullscreen()
     ImDrawListFlags InitialFlags;               // Initial flags at the beginning of the frame (it is possible to alter flags on a per-drawlist basis afterwards)
 
@@ -1006,7 +1061,7 @@ struct ImGuiDockNode
     ImVec2                  Size;                       // Current size
     ImVec2                  SizeRef;                    // [Split node only] Last explicitly written-to size (overridden when using a splitter affecting the node), used to calculate Size.
     int                     SplitAxis;                  // [Split node only] Split axis (X or Y)
-    ImGuiWindowClass        WindowClass;
+    ImGuiWindowClass        WindowClass;                // [Root node only]
 
     ImGuiDockNodeState      State;
     ImGuiWindow*            HostWindow;
@@ -1207,7 +1262,7 @@ struct ImGuiContext
     ImGuiID                 DragDropAcceptIdPrev;               // Target item id from previous frame (we need to store this to allow for overlapping drag and drop targets)
     int                     DragDropAcceptFrameCount;           // Last time a target expressed a desire to accept the source
     ImVector<unsigned char> DragDropPayloadBufHeap;             // We don't expose the ImVector<> directly
-    unsigned char           DragDropPayloadBufLocal[8];         // Local buffer for small payloads
+    unsigned char           DragDropPayloadBufLocal[16];        // Local buffer for small payloads
 
     // Tab bars
     ImGuiTabBar*                    CurrentTabBar;
@@ -1222,6 +1277,7 @@ struct ImGuiContext
     ImGuiID                 TempInputTextId;                    // Temporary text input when CTRL+clicking on a slider, etc.
     ImGuiColorEditFlags     ColorEditOptions;                   // Store user options for color edit widgets
     float                   ColorEditLastHue;                   // Backup of last Hue associated to LastColor[3], so we can restore Hue in lossy RGB<>HSV round trips
+    float                   ColorEditLastSat;                   // Backup of last Saturation associated to LastColor[3], so we can restore Saturation in lossy RGB<>HSV round trips
     float                   ColorEditLastColor[3];
     ImVec4                  ColorPickerRef;                     // Initial/reference color at the time of opening the color picker.
     bool                    DragCurrentAccumDirty;
@@ -1254,7 +1310,7 @@ struct ImGuiContext
     // Capture/Logging
     bool                    LogEnabled;
     ImGuiLogType            LogType;
-    FILE*                   LogFile;                            // If != NULL log to stdout/ file
+    ImFileHandle            LogFile;                            // If != NULL log to stdout/ file
     ImGuiTextBuffer         LogBuffer;                          // Accumulation buffer when log to clipboard. This is pointer so our GImGui static constructor doesn't call heap allocators.
     float                   LogLinePosY;
     bool                    LogLineFirstItem;
@@ -1377,7 +1433,7 @@ struct ImGuiContext
         LastValidMousePos = ImVec2(0.0f, 0.0f);
         TempInputTextId = 0;
         ColorEditOptions = ImGuiColorEditFlags__OptionsDefault;
-        ColorEditLastHue = 0.0f;
+        ColorEditLastHue = ColorEditLastSat = 0.0f;
         ColorEditLastColor[0] = ColorEditLastColor[1] = ColorEditLastColor[2] = FLT_MAX;
         DragCurrentAccumDirty = false;
         DragCurrentAccum = 0.0f;
@@ -1656,7 +1712,7 @@ enum ImGuiTabBarFlagsPrivate_
 // Extend ImGuiTabItemFlags_
 enum ImGuiTabItemFlagsPrivate_
 {
-    ImGuiTabItemFlags_NoCloseButton             = 1 << 20,  // Store whether p_open is set or not, which we need to recompute ContentWidth during layout.
+    ImGuiTabItemFlags_NoCloseButton             = 1 << 20,  // Track whether p_open was set or not (we'll need this info on the next frame to recompute ContentWidth during layout)
     ImGuiTabItemFlags_Unsorted                  = 1 << 21,  // [Docking] Trailing tabs with the _Unsorted flag will be sorted based on the DockOrder of their Window.
     ImGuiTabItemFlags_Preview                   = 1 << 22   // [Docking] Display tab shape for docking preview (height is adjusted slightly to compensate for the yet missing tab bar)
 };
@@ -1674,7 +1730,7 @@ struct ImGuiTabItem
     float               Width;                  // Width currently displayed
     float               ContentWidth;           // Width of actual contents, stored during BeginTabItem() call
 
-    ImGuiTabItem()      { ID = Flags = 0; Window = NULL; LastFrameVisible = LastFrameSelected = -1; NameOffset = -1; Offset = Width = ContentWidth = 0.0f; }
+    ImGuiTabItem()      { ID = 0; Flags = 0; Window = NULL; LastFrameVisible = LastFrameSelected = -1; NameOffset = -1; Offset = Width = ContentWidth = 0.0f; }
 };
 
 // Storage for a tab bar (sizeof() 92~96 bytes)
@@ -1758,7 +1814,7 @@ namespace ImGui
     // NewFrame
     IMGUI_API void          UpdateHoveredWindowAndCaptureFlags();
     IMGUI_API void          StartMouseMovingWindow(ImGuiWindow* window);
-    IMGUI_API void          StartMouseDragFromTitleBar(ImGuiWindow* window, ImGuiDockNode* node, bool from_collapse_button);
+    IMGUI_API void          StartMouseMovingWindowOrNode(ImGuiWindow* window, ImGuiDockNode* node, bool undock_floating_node);
     IMGUI_API void          UpdateMouseMovingWindowNewFrame();
     IMGUI_API void          UpdateMouseMovingWindowEndFrame();
 
@@ -1818,6 +1874,7 @@ namespace ImGui
     IMGUI_API void          LogToBuffer(int auto_open_depth = -1);              // Start logging/capturing to internal buffer
 
     // Popups, Modals, Tooltips
+    IMGUI_API bool          BeginChildEx(const char* name, ImGuiID id, const ImVec2& size_arg, bool border, ImGuiWindowFlags flags);
     IMGUI_API void          OpenPopupEx(ImGuiID id);
     IMGUI_API void          ClosePopupToLevel(int remaining, bool restore_focus_to_window_under_popup);
     IMGUI_API void          ClosePopupsOverWindow(ImGuiWindow* ref_window, bool restore_focus_to_window_under_popup);
@@ -1846,7 +1903,7 @@ namespace ImGui
     inline bool             IsActiveIdUsingNavDir(ImGuiDir dir)                         { ImGuiContext& g = *GImGui; return (g.ActiveIdUsingNavDirMask & (1 << dir)) != 0; }
     inline bool             IsActiveIdUsingNavInput(ImGuiNavInput input)                { ImGuiContext& g = *GImGui; return (g.ActiveIdUsingNavInputMask & (1 << input)) != 0; }
     inline bool             IsActiveIdUsingKey(ImGuiKey key)                            { ImGuiContext& g = *GImGui; IM_ASSERT(key < 64); return (g.ActiveIdUsingKeyInputMask & ((ImU64)1 << key)) != 0; }
-    IMGUI_API bool          IsMouseDragPastThreshold(int button, float lock_threshold = -1.0f);
+    IMGUI_API bool          IsMouseDragPastThreshold(ImGuiMouseButton button, float lock_threshold = -1.0f);
     inline bool             IsKeyPressedMap(ImGuiKey key, bool repeat = true)           { ImGuiContext& g = *GImGui; const int key_index = g.IO.KeyMap[key]; return (key_index >= 0) ? IsKeyPressed(key_index, repeat) : false; }
     inline bool             IsNavInputDown(ImGuiNavInput n)                             { ImGuiContext& g = *GImGui; return g.IO.NavInputs[n] > 0.0f; }
     inline bool             IsNavInputTest(ImGuiNavInput n, ImGuiInputReadMode rm)      { return (GetNavInputAmount(n, rm) > 0.0f); }
@@ -1865,10 +1922,11 @@ namespace ImGui
     IMGUI_API void          DockContextQueueUndockNode(ImGuiContext* ctx, ImGuiDockNode* node);
     IMGUI_API bool          DockContextCalcDropPosForDocking(ImGuiWindow* target, ImGuiDockNode* target_node, ImGuiWindow* payload, ImGuiDir split_dir, bool split_outer, ImVec2* out_pos);
     inline ImGuiDockNode*   DockNodeGetRootNode(ImGuiDockNode* node) { while (node->ParentNode) node = node->ParentNode; return node; }
+    inline ImGuiDockNode*   GetWindowDockNode() { ImGuiContext& g = *GImGui; return g.CurrentWindow->DockNode; }
     IMGUI_API bool          GetWindowAlwaysWantOwnTabBar(ImGuiWindow* window);
     IMGUI_API void          BeginDocked(ImGuiWindow* window, bool* p_open);
-    IMGUI_API void          BeginAsDockableDragDropSource(ImGuiWindow* window);
-    IMGUI_API void          BeginAsDockableDragDropTarget(ImGuiWindow* window);
+    IMGUI_API void          BeginDockableDragDropSource(ImGuiWindow* window);
+    IMGUI_API void          BeginDockableDragDropTarget(ImGuiWindow* window);
     IMGUI_API void          SetWindowDock(ImGuiWindow* window, ImGuiID dock_id, ImGuiCond cond);
 
     // Docking - Builder function needs to be generally called before the node is used/submitted.
@@ -1963,7 +2021,8 @@ namespace ImGui
     IMGUI_API bool          ArrowButtonEx(const char* str_id, ImGuiDir dir, ImVec2 size_arg, ImGuiButtonFlags flags);
     IMGUI_API void          Scrollbar(ImGuiAxis axis);
     IMGUI_API bool          ScrollbarEx(const ImRect& bb, ImGuiID id, ImGuiAxis axis, float* p_scroll_v, float avail_v, float contents_v, ImDrawCornerFlags rounding_corners);
-    IMGUI_API ImGuiID       GetScrollbarID(ImGuiWindow* window, ImGuiAxis axis);
+    IMGUI_API ImGuiID       GetWindowScrollbarID(ImGuiWindow* window, ImGuiAxis axis);
+    IMGUI_API ImGuiID       GetWindowResizeID(ImGuiWindow* window, int n); // 0..3: corners, 4..7: borders
     IMGUI_API void          SeparatorEx(ImGuiSeparatorFlags flags);
 
     // Widgets low-level behaviors

3rdparty/ocornut-imgui/imgui_widgets.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.74 WIP
+// dear imgui, v1.75 WIP
 // (widgets code)
 
 /*
@@ -462,7 +462,7 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
     }
 
     // Default behavior requires click+release on same spot
-    if ((flags & (ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnClick | ImGuiButtonFlags_PressedOnRelease | ImGuiButtonFlags_PressedOnDoubleClick)) == 0)
+    if ((flags & ImGuiButtonFlags_PressedOnMask_) == 0)
         flags |= ImGuiButtonFlags_PressedOnClickRelease;
 
     ImGuiWindow* backup_hovered_window = g.HoveredWindow;
@@ -507,7 +507,7 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
     {
         if (!(flags & ImGuiButtonFlags_NoKeyModifiers) || (!g.IO.KeyCtrl && !g.IO.KeyShift && !g.IO.KeyAlt))
         {
-            if ((flags & ImGuiButtonFlags_PressedOnClickRelease) && g.IO.MouseClicked[0])
+            if ((flags & (ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnClickReleaseAnywhere)) && g.IO.MouseClicked[0])
             {
                 SetActiveID(id, window);
                 if (!(flags & ImGuiButtonFlags_NoNavFocus))
@@ -577,7 +577,9 @@ bool ImGui::ButtonBehavior(const ImRect& bb, ImGuiID id, bool* out_hovered, bool
             }
             else
             {
-                if (hovered && (flags & ImGuiButtonFlags_PressedOnClickRelease) && !g.DragDropActive)
+                const bool release_in = hovered && (flags & ImGuiButtonFlags_PressedOnClickRelease) != 0;
+                const bool release_anywhere = (flags & ImGuiButtonFlags_PressedOnClickReleaseAnywhere) != 0;
+                if ((release_in || release_anywhere) && !g.DragDropActive)
                 {
                     bool is_double_click_release = (flags & ImGuiButtonFlags_PressedOnDoubleClick) && g.IO.MouseDownWasDoubleClick[0];
                     bool is_repeating_already = (flags & ImGuiButtonFlags_Repeat) && g.IO.MouseDownDurationPrev[0] >= g.IO.KeyRepeatDelay; // Repeat mode trumps <on release>
@@ -776,12 +778,12 @@ bool ImGui::CollapseButton(ImGuiID id, const ImVec2& pos, ImGuiDockNode* dock_no
 
     // Switch to moving the window after mouse is moved beyond the initial drag threshold
     if (IsItemActive() && IsMouseDragging(0))
-        StartMouseDragFromTitleBar(window, dock_node, true);
+        StartMouseMovingWindowOrNode(window, dock_node, true);
 
     return pressed;
 }
 
-ImGuiID ImGui::GetScrollbarID(ImGuiWindow* window, ImGuiAxis axis)
+ImGuiID ImGui::GetWindowScrollbarID(ImGuiWindow* window, ImGuiAxis axis)
 {
     return window->GetIDNoKeepAlive(axis == ImGuiAxis_X ? "#SCROLLX" : "#SCROLLY");
 }
@@ -888,7 +890,7 @@ void ImGui::Scrollbar(ImGuiAxis axis)
     ImGuiContext& g = *GImGui;
     ImGuiWindow* window = g.CurrentWindow;
 
-    const ImGuiID id = GetScrollbarID(window, axis);
+    const ImGuiID id = GetWindowScrollbarID(window, axis);
     KeepAliveID(id);
 
     // Calculate scrollbar bounding box
@@ -1266,21 +1268,14 @@ void ImGui::SeparatorEx(ImGuiSeparatorFlags flags)
         // We don't provide our width to the layout so that it doesn't get feed back into AutoFit
         const ImRect bb(ImVec2(x1, window->DC.CursorPos.y), ImVec2(x2, window->DC.CursorPos.y + thickness_draw));
         ItemSize(ImVec2(0.0f, thickness_layout));
-        if (!ItemAdd(bb, 0))
+        const bool item_visible = ItemAdd(bb, 0);
+        if (item_visible)
         {
-            if (columns)
-            {
-                PopColumnsBackground();
-                columns->LineMinY = window->DC.CursorPos.y;
-            }
-            return;
+            // Draw
+            window->DrawList->AddLine(bb.Min, ImVec2(bb.Max.x, bb.Min.y), GetColorU32(ImGuiCol_Separator));
+            if (g.LogEnabled)
+                LogRenderedText(&bb.Min, "--------------------------------");
         }
-
-        // Draw
-        window->DrawList->AddLine(bb.Min, ImVec2(bb.Max.x, bb.Min.y), GetColorU32(ImGuiCol_Separator));
-        if (g.LogEnabled)
-            LogRenderedText(&bb.Min, "--------------------------------");
-
         if (columns)
         {
             PopColumnsBackground();
@@ -2481,7 +2476,7 @@ bool ImGui::SliderBehaviorT(const ImRect& bb, ImGuiID id, ImGuiDataType data_typ
     return value_changed;
 }
 
-// For 32-bits and larger types, slider bounds are limited to half the natural type range.
+// For 32-bit and larger types, slider bounds are limited to half the natural type range.
 // So e.g. an integer Slider between INT_MAX-10 and INT_MAX will fail, but an integer Slider between INT_MAX/2-10 and INT_MAX/2 will be ok.
 // It would be possible to lift that limitation with some work but it doesn't seem to be worth it for sliders.
 bool ImGui::SliderBehavior(const ImRect& bb, ImGuiID id, ImGuiDataType data_type, void* p_v, const void* p_min, const void* p_max, const char* format, float power, ImGuiSliderFlags flags, ImRect* out_grab_bb)
@@ -3164,7 +3159,7 @@ namespace ImStb
 static int     STB_TEXTEDIT_STRINGLEN(const STB_TEXTEDIT_STRING* obj)                             { return obj->CurLenW; }
 static ImWchar STB_TEXTEDIT_GETCHAR(const STB_TEXTEDIT_STRING* obj, int idx)                      { return obj->TextW[idx]; }
 static float   STB_TEXTEDIT_GETWIDTH(STB_TEXTEDIT_STRING* obj, int line_start_idx, int char_idx)  { ImWchar c = obj->TextW[line_start_idx + char_idx]; if (c == '\n') return STB_TEXTEDIT_GETWIDTH_NEWLINE; ImGuiContext& g = *GImGui; return g.Font->GetCharAdvance(c) * (g.FontSize / g.Font->FontSize); }
-static int     STB_TEXTEDIT_KEYTOTEXT(int key)                                                    { return key >= 0x10000 ? 0 : key; }
+static int     STB_TEXTEDIT_KEYTOTEXT(int key)                                                    { return key >= 0x200000 ? 0 : key; }
 static ImWchar STB_TEXTEDIT_NEWLINE = '\n';
 static void    STB_TEXTEDIT_LAYOUTROW(StbTexteditRow* r, STB_TEXTEDIT_STRING* obj, int line_start_idx)
 {
@@ -3347,6 +3342,10 @@ static bool InputTextFilterCharacter(unsigned int* p_char, ImGuiInputTextFlags f
     if (c >= 0xE000 && c <= 0xF8FF)
         return false;
 
+    // Filter Unicode ranges we are not handling in this build.
+    if (c > IM_UNICODE_CODEPOINT_MAX)
+        return false;
+
     // Generic named filters
     if (flags & (ImGuiInputTextFlags_CharsDecimal | ImGuiInputTextFlags_CharsHexadecimal | ImGuiInputTextFlags_CharsUppercase | ImGuiInputTextFlags_CharsNoBlank | ImGuiInputTextFlags_CharsScientific))
     {
@@ -3471,8 +3470,8 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
 
     const bool user_clicked = hovered && io.MouseClicked[0];
     const bool user_nav_input_start = (g.ActiveId != id) && ((g.NavInputId == id) || (g.NavActivateId == id && g.NavInputSource == ImGuiInputSource_NavKeyboard));
-    const bool user_scroll_finish = is_multiline && state != NULL && g.ActiveId == 0 && g.ActiveIdPreviousFrame == GetScrollbarID(draw_window, ImGuiAxis_Y);
-    const bool user_scroll_active = is_multiline && state != NULL && g.ActiveId == GetScrollbarID(draw_window, ImGuiAxis_Y);
+    const bool user_scroll_finish = is_multiline && state != NULL && g.ActiveId == 0 && g.ActiveIdPreviousFrame == GetWindowScrollbarID(draw_window, ImGuiAxis_Y);
+    const bool user_scroll_active = is_multiline && state != NULL && g.ActiveId == GetWindowScrollbarID(draw_window, ImGuiAxis_Y);
 
     bool clear_active_id = false;
     bool select_all = (g.ActiveId != id) && ((flags & ImGuiInputTextFlags_AutoSelectAll) != 0 || user_nav_input_start) && (!is_multiline);
@@ -3770,7 +3769,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
                     s += ImTextCharFromUtf8(&c, s, NULL);
                     if (c == 0)
                         break;
-                    if (c >= 0x10000 || !InputTextFilterCharacter(&c, flags, callback, callback_user_data))
+                    if (!InputTextFilterCharacter(&c, flags, callback, callback_user_data))
                         continue;
                     clipboard_filtered[clipboard_filtered_len++] = (ImWchar)c;
                 }
@@ -3994,7 +3993,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
             // In multi-line mode, we never exit the loop until all lines are counted, so add one extra to the searches_remaining counter.
             searches_remaining += is_multiline ? 1 : 0;
             int line_count = 0;
-            //for (const ImWchar* s = text_begin; (s = (const ImWchar*)wcschr((const wchar_t*)s, (wchar_t)'\n')) != NULL; s++)  // FIXME-OPT: Could use this when wchar_t are 16-bits
+            //for (const ImWchar* s = text_begin; (s = (const ImWchar*)wcschr((const wchar_t*)s, (wchar_t)'\n')) != NULL; s++)  // FIXME-OPT: Could use this when wchar_t are 16-bit
             for (const ImWchar* s = text_begin; *s != 0; s++)
                 if (*s == '\n')
                 {
@@ -4071,7 +4070,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
                     break;
                 if (rect_pos.y < clip_rect.y)
                 {
-                    //p = (const ImWchar*)wmemchr((const wchar_t*)p, '\n', text_selected_end - p);  // FIXME-OPT: Could use this when wchar_t are 16-bits
+                    //p = (const ImWchar*)wmemchr((const wchar_t*)p, '\n', text_selected_end - p);  // FIXME-OPT: Could use this when wchar_t are 16-bit
                     //p = p ? p + 1 : text_selected_end;
                     while (p < text_selected_end)
                         if (*p++ == '\n')
@@ -4235,8 +4234,13 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
     {
         // Hue is lost when converting from greyscale rgb (saturation=0). Restore it.
         ColorConvertRGBtoHSV(f[0], f[1], f[2], f[0], f[1], f[2]);
-        if (f[1] == 0 && memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0)
-            f[0] = g.ColorEditLastHue;
+        if (memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0)
+        {
+            if (f[1] == 0)
+                f[0] = g.ColorEditLastHue;
+            if (f[2] == 0)
+                f[1] = g.ColorEditLastSat;
+        }
     }
     int i[4] = { IM_F32_TO_INT8_UNBOUND(f[0]), IM_F32_TO_INT8_UNBOUND(f[1]), IM_F32_TO_INT8_UNBOUND(f[2]), IM_F32_TO_INT8_UNBOUND(f[3]) };
 
@@ -4275,16 +4279,15 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
                 SameLine(0, style.ItemInnerSpacing.x);
             SetNextItemWidth((n + 1 < components) ? w_item_one : w_item_last);
 
-            // Disable Hue edit when Saturation is zero
-            const bool disable_hue_edit = (n == 0 && (flags & ImGuiColorEditFlags_DisplayHSV) && i[1] == 0);
+            // FIXME: When ImGuiColorEditFlags_HDR flag is passed HS values snap in weird ways when SV values go below 0.
             if (flags & ImGuiColorEditFlags_Float)
             {
-                value_changed |= DragFloat(ids[n], &f[n], 1.0f/255.0f, disable_hue_edit ? +FLT_MAX : 0.0f, disable_hue_edit ? -FLT_MAX : hdr ? 0.0f : 1.0f, fmt_table_float[fmt_idx][n]);
+                value_changed |= DragFloat(ids[n], &f[n], 1.0f/255.0f, 0.0f, hdr ? 0.0f : 1.0f, fmt_table_float[fmt_idx][n]);
                 value_changed_as_float |= value_changed;
             }
             else
             {
-                value_changed |= DragInt(ids[n], &i[n], 1.0f, disable_hue_edit ? INT_MAX : 0, disable_hue_edit ? INT_MIN : hdr ? 0 : 255, fmt_table_int[fmt_idx][n]);
+                value_changed |= DragInt(ids[n], &i[n], 1.0f, 0, hdr ? 0 : 255, fmt_table_int[fmt_idx][n]);
             }
             if (!(flags & ImGuiColorEditFlags_NoOptions))
                 OpenPopupOnItemClick("context");
@@ -4353,7 +4356,8 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
 
     if (label != label_display_end && !(flags & ImGuiColorEditFlags_NoLabel))
     {
-        window->DC.CursorPos = ImVec2(pos.x + w_full + style.ItemInnerSpacing.x, pos.y + style.FramePadding.y);
+        const float text_offset_x = (flags & ImGuiColorEditFlags_NoInputs) ? w_button : w_full + style.ItemInnerSpacing.x;
+        window->DC.CursorPos = ImVec2(pos.x + text_offset_x, pos.y + style.FramePadding.y);
         TextEx(label, label_display_end);
     }
 
@@ -4366,6 +4370,7 @@ bool ImGui::ColorEdit4(const char* label, float col[4], ImGuiColorEditFlags flag
         if ((flags & ImGuiColorEditFlags_DisplayHSV) && (flags & ImGuiColorEditFlags_InputRGB))
         {
             g.ColorEditLastHue = f[0];
+            g.ColorEditLastSat = f[1];
             ColorConvertHSVtoRGB(f[0], f[1], f[2], f[0], f[1], f[2]);
             memcpy(g.ColorEditLastColor, f, sizeof(float) * 3);
         }
@@ -4548,8 +4553,13 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
     {
         // Hue is lost when converting from greyscale rgb (saturation=0). Restore it.
         ColorConvertRGBtoHSV(R, G, B, H, S, V);
-        if (S == 0 && memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0)
-            H = g.ColorEditLastHue;
+        if (memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0)
+        {
+            if (S == 0)
+                H = g.ColorEditLastHue;
+            if (V == 0)
+                S = g.ColorEditLastSat;
+        }
     }
     else if (flags & ImGuiColorEditFlags_InputHSV)
     {
@@ -4677,6 +4687,7 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
         {
             ColorConvertHSVtoRGB(H >= 1.0f ? H - 10 * 1e-6f : H, S > 0.0f ? S : 10*1e-6f, V > 0.0f ? V : 1e-6f, col[0], col[1], col[2]);
             g.ColorEditLastHue = H;
+            g.ColorEditLastSat = S;
             memcpy(g.ColorEditLastColor, col, sizeof(float) * 3);
         }
         else if (flags & ImGuiColorEditFlags_InputHSV)
@@ -4731,8 +4742,13 @@ bool ImGui::ColorPicker4(const char* label, float col[4], ImGuiColorEditFlags fl
             G = col[1];
             B = col[2];
             ColorConvertRGBtoHSV(R, G, B, H, S, V);
-            if (S == 0 && memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0) // Fix local Hue as display below will use it immediately.
-                H = g.ColorEditLastHue;
+            if (memcmp(g.ColorEditLastColor, col, sizeof(float) * 3) == 0) // Fix local Hue as display below will use it immediately.
+            {
+                if (S == 0)
+                    H = g.ColorEditLastHue;
+                if (V == 0)
+                    S = g.ColorEditLastSat;
+            }
         }
         else if (flags & ImGuiColorEditFlags_InputHSV)
         {
@@ -5284,10 +5300,12 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
         button_flags |= ImGuiButtonFlags_AllowItemOverlap;
     if (flags & ImGuiTreeNodeFlags_OpenOnDoubleClick)
         button_flags |= ImGuiButtonFlags_PressedOnDoubleClick | ((flags & ImGuiTreeNodeFlags_OpenOnArrow) ? ImGuiButtonFlags_PressedOnClickRelease : 0);
+    else
+        button_flags |= ImGuiButtonFlags_PressedOnClickRelease;
     if (!is_leaf)
         button_flags |= ImGuiButtonFlags_PressedOnDragDropHold;
 
-    // We allow clicking on the arrow section with keyboard modifiers held, in order to easily 
+    // We allow clicking on the arrow section with keyboard modifiers held, in order to easily
     // allow browsing a tree while preserving selection with code implementing multi-selection patterns.
     // When clicking on the rest of the tree node we always disallow keyboard modifiers.
     const float hit_padding_x = style.TouchExtraPadding.x;
@@ -5295,7 +5313,7 @@ bool ImGui::TreeNodeBehavior(ImGuiID id, ImGuiTreeNodeFlags flags, const char* l
     const float arrow_hit_x2 = (text_pos.x - text_offset_x) + (g.FontSize + padding.x * 2.0f) + hit_padding_x;
     if (window != g.HoveredWindow || !(g.IO.MousePos.x >= arrow_hit_x1 && g.IO.MousePos.x < arrow_hit_x2))
         button_flags |= ImGuiButtonFlags_NoKeyModifiers;
-    
+
     bool selected = (flags & ImGuiTreeNodeFlags_Selected) != 0;
     const bool was_selected = selected;
 
@@ -5569,12 +5587,12 @@ bool ImGui::Selectable(const char* label, bool selected, ImGuiSelectableFlags fl
 
     // We use NoHoldingActiveID on menus so user can click and _hold_ on a menu then drag to browse child entries
     ImGuiButtonFlags button_flags = 0;
-    if (flags & ImGuiSelectableFlags_NoHoldingActiveID) button_flags |= ImGuiButtonFlags_NoHoldingActiveID;
-    if (flags & ImGuiSelectableFlags_PressedOnClick) button_flags |= ImGuiButtonFlags_PressedOnClick;
-    if (flags & ImGuiSelectableFlags_PressedOnRelease) button_flags |= ImGuiButtonFlags_PressedOnRelease;
-    if (flags & ImGuiSelectableFlags_Disabled) button_flags |= ImGuiButtonFlags_Disabled;
-    if (flags & ImGuiSelectableFlags_AllowDoubleClick) button_flags |= ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnDoubleClick;
-    if (flags & ImGuiSelectableFlags_AllowItemOverlap) button_flags |= ImGuiButtonFlags_AllowItemOverlap;
+    if (flags & ImGuiSelectableFlags_NoHoldingActiveID) { button_flags |= ImGuiButtonFlags_NoHoldingActiveID; }
+    if (flags & ImGuiSelectableFlags_PressedOnClick)    { button_flags |= ImGuiButtonFlags_PressedOnClick; }
+    if (flags & ImGuiSelectableFlags_PressedOnRelease)  { button_flags |= ImGuiButtonFlags_PressedOnRelease; }
+    if (flags & ImGuiSelectableFlags_Disabled)          { button_flags |= ImGuiButtonFlags_Disabled; }
+    if (flags & ImGuiSelectableFlags_AllowDoubleClick)  { button_flags |= ImGuiButtonFlags_PressedOnClickRelease | ImGuiButtonFlags_PressedOnDoubleClick; }
+    if (flags & ImGuiSelectableFlags_AllowItemOverlap)  { button_flags |= ImGuiButtonFlags_AllowItemOverlap; }
 
     if (flags & ImGuiSelectableFlags_Disabled)
         selected = false;
@@ -6491,7 +6509,7 @@ void    ImGui::EndTabBar()
     ImGuiTabBar* tab_bar = g.CurrentTabBar;
     if (tab_bar == NULL)
     {
-        IMGUI_USER_ERROR(tab_bar != NULL, "Mismatched BeginTabBar()/EndTabBar()!");
+        IM_ASSERT_USER_ERROR(tab_bar != NULL, "Mismatched BeginTabBar()/EndTabBar()!");
         return;
     }
     if (tab_bar->WantLayout)
@@ -6923,7 +6941,7 @@ bool    ImGui::BeginTabItem(const char* label, bool* p_open, ImGuiTabItemFlags f
     ImGuiTabBar* tab_bar = g.CurrentTabBar;
     if (tab_bar == NULL)
     {
-        IMGUI_USER_ERROR(tab_bar, "BeginTabItem() Needs to be called between BeginTabBar() and EndTabBar()!");
+        IM_ASSERT_USER_ERROR(tab_bar, "BeginTabItem() Needs to be called between BeginTabBar() and EndTabBar()!");
         return false;
     }
     bool ret = TabItemEx(tab_bar, label, p_open, flags, NULL);
@@ -6977,6 +6995,12 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
         return false;
     }
 
+    // Store into ImGuiTabItemFlags_NoCloseButton, also honor ImGuiTabItemFlags_NoCloseButton passed by user (although not documented)
+    if (flags & ImGuiTabItemFlags_NoCloseButton)
+        p_open = NULL;
+    else if (p_open == NULL)
+        flags |= ImGuiTabItemFlags_NoCloseButton;
+
     // Calculate tab contents size
     ImVec2 size = TabItemCalcSize(label, p_open != NULL);
 
@@ -6994,9 +7018,6 @@ bool    ImGui::TabItemEx(ImGuiTabBar* tab_bar, const char* label, bool* p_open,
     tab_bar->LastTabItemIdx = (short)tab_bar->Tabs.index_from_ptr(tab);
     tab->ContentWidth = size.x;
 
-    if (p_open == NULL)
-        flags |= ImGuiTabItemFlags_NoCloseButton;
-
     const bool tab_bar_appearing = (tab_bar->PrevFrameVisible + 1 < g.FrameCount);
     const bool tab_bar_focused = (tab_bar->Flags & ImGuiTabBarFlags_IsFocused) != 0;
     const bool tab_appearing = (tab->LastFrameVisible + 1 < g.FrameCount);
@@ -7521,8 +7542,8 @@ void ImGui::BeginColumns(const char* str_id, int columns_count, ImGuiColumnsFlag
     ImGuiContext& g = *GImGui;
     ImGuiWindow* window = GetCurrentWindow();
 
-    IM_ASSERT(columns_count >= 1);
-    IM_ASSERT(window->DC.CurrentColumns == NULL); // Nested columns are currently not supported
+    IM_ASSERT(columns_count >= 1 && columns_count <= 64);   // Maximum 64 columns
+    IM_ASSERT(window->DC.CurrentColumns == NULL);           // Nested columns are currently not supported
 
     // Acquire storage for the columns set
     ImGuiID id = GetColumnsID(str_id, columns_count);