Merge branch 'master' into docking

# Conflicts:
#	backends/imgui_impl_vulkan.cpp

backends/imgui_impl_vulkan.cpp

@@ -28,6 +28,7 @@
 // CHANGELOG
 // (minor and older changes stripped away, please see git history for details)
 //  2024-XX-XX: Platform: Added support for multiple windows via the ImGuiPlatformIO interface.
+//  2024-12-11: Vulkan: Fixed setting VkSwapchainCreateInfoKHR::preTransform for platforms not supporting VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR. (#8222)
 //  2024-11-27: Vulkan: Make user-provided descriptor pool optional. As a convenience, when setting init_info->DescriptorPoolSize the backend will create one itself. (#8172, #4867)
 //  2024-10-07: Vulkan: Changed default texture sampler to Clamp instead of Repeat/Wrap.
 //  2024-10-07: Vulkan: Expose selected render state in ImGui_ImplVulkan_RenderState, which you can access in 'void* platform_io.Renderer_RenderState' during draw callbacks.
@@ -1475,6 +1476,10 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkPhysicalDevice physical_device, V
 
     // Create Swapchain
     {
+        VkSurfaceCapabilitiesKHR cap;
+        err = vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physical_device, wd->Surface, &cap);
+        check_vk_result(err);
+
         VkSwapchainCreateInfoKHR info = {};
         info.sType = VK_STRUCTURE_TYPE_SWAPCHAIN_CREATE_INFO_KHR;
         info.surface = wd->Surface;
@@ -1484,19 +1489,15 @@ void ImGui_ImplVulkanH_CreateWindowSwapChain(VkPhysicalDevice physical_device, V
         info.imageArrayLayers = 1;
         info.imageUsage = VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
         info.imageSharingMode = VK_SHARING_MODE_EXCLUSIVE;           // Assume that graphics family == present family
-        info.preTransform = VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR;
+        info.preTransform = (cap.supportedTransforms & VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR) ? VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR : cap.currentTransform;
         info.compositeAlpha = VK_COMPOSITE_ALPHA_OPAQUE_BIT_KHR;
         info.presentMode = wd->PresentMode;
         info.clipped = VK_TRUE;
         info.oldSwapchain = old_swapchain;
-        VkSurfaceCapabilitiesKHR cap;
-        err = vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physical_device, wd->Surface, &cap);
-        check_vk_result(err);
         if (info.minImageCount < cap.minImageCount)
             info.minImageCount = cap.minImageCount;
         else if (cap.maxImageCount != 0 && info.minImageCount > cap.maxImageCount)
             info.minImageCount = cap.maxImageCount;
-
         if (cap.currentExtent.width == 0xffffffff)
         {
             info.imageExtent.width = wd->Width = w;

docs/CHANGELOG.txt

@@ -35,10 +35,33 @@ HOW TO UPDATE?
   and API updates have been a little more frequent lately. They are documented below and in imgui.cpp and should not affect all users.
 - Please report any issue!
 
+-----------------------------------------------------------------------
+ VERSION 1.91.7 WIP (In Progress)
+-----------------------------------------------------------------------
+
+Breaking changes:
+
+Other changes:
+
+- InputText: Fixed a bug where character replacements performed from a callback
+  were not applied when pasting from clipbard. (#8229)
+- InputText: Fixed issue when activating a ReadOnly field when the underlying
+  value is being modified. (#8242)
+- Drags: Added ImGuiSliderFlags_NoSpeedTweaks flag to disable keyboard
+  modifiers altering the tweak speed. Useful if you want to alter tweak speed
+  yourself based on your own logic. (#8223)
+- Nav: Fixed an issue where Alt key would clear current active item on
+  windows with the ImGuiWindowFlags_NoNavInputs flag. (#8231)
+- Backends: Vulkan: Fixed setting VkSwapchainCreateInfoKHR::preTransform for
+  platforms not supporting VK_SURFACE_TRANSFORM_IDENTITY_BIT_KHR. (#8222) [@Zer0xFF]
+
+
 -----------------------------------------------------------------------
  VERSION 1.91.6 (Released 2024-12-11)
 -----------------------------------------------------------------------
 
+Decorated log and release notes: https://github.com/ocornut/imgui/releases/tag/v1.91.6
+
 Breaking changes:
 
 - Backends: DX12: Changed ImGui_ImplDX12_Init() signature to take a

imgui.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.91.6
+// dear imgui, v1.91.7 WIP
 // (main code and documentation)
 
 // Help:
@@ -3999,6 +3999,7 @@ ImGuiContext::ImGuiContext(ImFontAtlas* shared_font_atlas)
     ActiveIdPreviousFrameIsAlive = false;
     ActiveIdPreviousFrameHasBeenEditedBefore = false;
     ActiveIdPreviousFrameWindow = NULL;
+    memset(&ActiveIdValueOnActivation, 0, sizeof(ActiveIdValueOnActivation));
     LastActiveId = 0;
     LastActiveIdTimer = 0.0f;
 
@@ -4456,7 +4457,7 @@ void ImGui::SetActiveID(ImGuiID id, ImGuiWindow* window)
 
         // This could be written in a more general way (e.g associate a hook to ActiveId),
         // but since this is currently quite an exception we'll leave it as is.
-        // One common scenario leading to this is: pressing Key ->NavMoveRequestApplyResult() -> ClearActiveId()
+        // One common scenario leading to this is: pressing Key ->NavMoveRequestApplyResult() -> ClearActiveID()
         if (g.InputTextState.ID == g.ActiveId)
             InputTextDeactivateHook(g.ActiveId);
     }
@@ -7880,9 +7881,12 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         {
             IM_ASSERT(window->IDStack.Size == 1);
             window->IDStack.Size = 0; // As window->IDStack[0] == window->ID here, make sure TestEngine doesn't erroneously see window as parent of itself.
+            window->DC.NavLayerCurrent = ImGuiNavLayer_Menu;
             IMGUI_TEST_ENGINE_ITEM_ADD(window->ID, window->Rect(), NULL);
             IMGUI_TEST_ENGINE_ITEM_INFO(window->ID, window->Name, (g.HoveredWindow == window) ? ImGuiItemStatusFlags_HoveredRect : 0);
             window->IDStack.Size = 1;
+            window->DC.NavLayerCurrent = ImGuiNavLayer_Main;
+
         }
 #endif
 
@@ -8189,7 +8193,11 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
         // [Test Engine] Register title bar / tab with MoveId.
 #ifdef IMGUI_ENABLE_TEST_ENGINE
         if (!(window->Flags & ImGuiWindowFlags_NoTitleBar))
+        {
+            window->DC.NavLayerCurrent = ImGuiNavLayer_Menu;
             IMGUI_TEST_ENGINE_ITEM_ADD(g.LastItemData.ID, g.LastItemData.Rect, &g.LastItemData);
+            window->DC.NavLayerCurrent = ImGuiNavLayer_Main;
+        }
 #endif
     }
     else
@@ -14328,15 +14336,16 @@ static void ImGui::NavUpdateWindowing()
     // Keyboard: Press and Release ALT to toggle menu layer
     const ImGuiKey windowing_toggle_keys[] = { ImGuiKey_LeftAlt, ImGuiKey_RightAlt };
     bool windowing_toggle_layer_start = false;
-    for (ImGuiKey windowing_toggle_key : windowing_toggle_keys)
-        if (nav_keyboard_active && IsKeyPressed(windowing_toggle_key, 0, ImGuiKeyOwner_NoOwner))
-        {
-            windowing_toggle_layer_start = true;
-            g.NavWindowingToggleLayer = true;
-            g.NavWindowingToggleKey = windowing_toggle_key;
-            g.NavInputSource = ImGuiInputSource_Keyboard;
-            break;
-        }
+    if (g.NavWindow != NULL && !(g.NavWindow->Flags & ImGuiWindowFlags_NoNavInputs))
+        for (ImGuiKey windowing_toggle_key : windowing_toggle_keys)
+            if (nav_keyboard_active && IsKeyPressed(windowing_toggle_key, 0, ImGuiKeyOwner_NoOwner))
+            {
+                windowing_toggle_layer_start = true;
+                g.NavWindowingToggleLayer = true;
+                g.NavWindowingToggleKey = windowing_toggle_key;
+                g.NavInputSource = ImGuiInputSource_Keyboard;
+                break;
+            }
     if (g.NavWindowingToggleLayer && g.NavInputSource == ImGuiInputSource_Keyboard)
     {
         // We cancel toggling nav layer when any text has been typed (generally while holding Alt). (See #370)

imgui.h

@@ -1,4 +1,4 @@
-// dear imgui, v1.91.6
+// dear imgui, v1.91.7 WIP
 // (headers)
 
 // Help:
@@ -28,8 +28,8 @@
 
 // Library Version
 // (Integer encoded as XYYZZ for use in #if preprocessor conditionals, e.g. '#if IMGUI_VERSION_NUM >= 12345')
-#define IMGUI_VERSION       "1.91.6"
-#define IMGUI_VERSION_NUM   19160
+#define IMGUI_VERSION       "1.91.7 WIP"
+#define IMGUI_VERSION_NUM   19162
 #define IMGUI_HAS_TABLE
 #define IMGUI_HAS_VIEWPORT          // Viewport WIP branch
 #define IMGUI_HAS_DOCK              // Docking WIP branch
@@ -700,6 +700,7 @@ namespace ImGui
 
     // Widgets: List Boxes
     // - This is essentially a thin wrapper to using BeginChild/EndChild with the ImGuiChildFlags_FrameStyle flag for stylistic changes + displaying a label.
+    // - If you don't need a label you can probably simply use BeginChild() with the ImGuiChildFlags_FrameStyle flag for the same result.
     // - You can submit contents and manage your selection state however you want it, by creating e.g. Selectable() or any other items.
     // - The simplified/old ListBox() api are helpers over BeginListBox()/EndListBox() which are kept available for convenience purpose. This is analoguous to how Combos are created.
     // - Choose frame width:   size.x > 0.0f: custom  /  size.x < 0.0f or -FLT_MIN: right-align   /  size.x = 0.0f (default): use current ItemWidth
@@ -1864,6 +1865,7 @@ enum ImGuiSliderFlags_
     ImGuiSliderFlags_WrapAround         = 1 << 8,       // Enable wrapping around from max to min and from min to max. Only supported by DragXXX() functions for now.
     ImGuiSliderFlags_ClampOnInput       = 1 << 9,       // Clamp value to min/max bounds when input manually with CTRL+Click. By default CTRL+Click allows going out of bounds.
     ImGuiSliderFlags_ClampZeroRange     = 1 << 10,      // Clamp even if min==max==0.0f. Otherwise due to legacy reason DragXXX functions don't clamp with those values. When your clamping limits are dynamic you almost always want to use it.
+    ImGuiSliderFlags_NoSpeedTweaks      = 1 << 11,      // Disable keyboard modifiers altering tweak speed. Useful if you want to alter tweak speed yourself based on your own logic.
     ImGuiSliderFlags_AlwaysClamp        = ImGuiSliderFlags_ClampOnInput | ImGuiSliderFlags_ClampZeroRange,
     ImGuiSliderFlags_InvalidMask_       = 0x7000000F,   // [Internal] We treat using those bits as being potentially a 'float power' argument from the previous API that has got miscast to this enum, and will trigger an assert if needed.
 };
@@ -3359,7 +3361,7 @@ struct ImFontConfig
     unsigned int    FontBuilderFlags;       // 0        // Settings for custom font builder. THIS IS BUILDER IMPLEMENTATION DEPENDENT. Leave as zero if unsure.
     float           RasterizerMultiply;     // 1.0f     // Linearly brighten (>1.0f) or darken (<1.0f) font output. Brightening small fonts may be a good workaround to make them more readable. This is a silly thing we may remove in the future.
     float           RasterizerDensity;      // 1.0f     // DPI scale for rasterization, not altering other font metrics: make it easy to swap between e.g. a 100% and a 400% fonts for a zooming display. IMPORTANT: If you increase this it is expected that you increase font scale accordingly, otherwise quality may look lowered.
-    ImWchar         EllipsisChar;           // -1       // Explicitly specify unicode codepoint of ellipsis character. When fonts are being merged first specified ellipsis will be used.
+    ImWchar         EllipsisChar;           // 0        // Explicitly specify unicode codepoint of ellipsis character. When fonts are being merged first specified ellipsis will be used.
 
     // [Internal]
     char            Name[40];               // Name (strictly to ease debugging)

imgui_demo.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.91.6
+// dear imgui, v1.91.7 WIP
 // (demo code)
 
 // Help:
@@ -2370,6 +2370,8 @@ static void ShowDemoWindowWidgets(ImGuiDemoWindowData* demo_data)
         ImGui::SameLine(); HelpMarker("Disable rounding underlying value to match precision of the format string (e.g. %.3f values are rounded to those 3 digits).");
         ImGui::CheckboxFlags("ImGuiSliderFlags_NoInput", &flags, ImGuiSliderFlags_NoInput);
         ImGui::SameLine(); HelpMarker("Disable CTRL+Click or Enter key allowing to input text directly into the widget.");
+        ImGui::CheckboxFlags("ImGuiSliderFlags_NoSpeedTweaks", &flags, ImGuiSliderFlags_NoSpeedTweaks);
+        ImGui::SameLine(); HelpMarker("Disable keyboard modifiers altering tweak speed. Useful if you want to alter tweak speed yourself based on your own logic.");
         ImGui::CheckboxFlags("ImGuiSliderFlags_WrapAround", &flags, ImGuiSliderFlags_WrapAround);
         ImGui::SameLine(); HelpMarker("Enable wrapping around from max to min and from min to max (only supported by DragXXX() functions)");
 

imgui_draw.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.91.6
+// dear imgui, v1.91.7 WIP
 // (drawing and font code)
 
 /*
@@ -2383,7 +2383,7 @@ ImFontConfig::ImFontConfig()
     GlyphMaxAdvanceX = FLT_MAX;
     RasterizerMultiply = 1.0f;
     RasterizerDensity = 1.0f;
-    EllipsisChar = (ImWchar)-1;
+    EllipsisChar = 0;
 }
 
 //-----------------------------------------------------------------------------
@@ -2570,9 +2570,6 @@ ImFont* ImFontAtlas::AddFont(const ImFontConfig* font_cfg)
     // - We may support it better later and remove this rounding.
     new_font_cfg.SizePixels = ImTrunc(new_font_cfg.SizePixels);
 
-    if (new_font_cfg.DstFont->EllipsisChar == (ImWchar)-1)
-        new_font_cfg.DstFont->EllipsisChar = font_cfg->EllipsisChar;
-
     // Pointers to ConfigData and BuilderData are otherwise dangling
     ImFontAtlasUpdateConfigDataPointers(this);
 
@@ -3641,8 +3638,8 @@ ImFont::ImFont()
 {
     FontSize = 0.0f;
     FallbackAdvanceX = 0.0f;
-    FallbackChar = (ImWchar)-1;
-    EllipsisChar = (ImWchar)-1;
+    FallbackChar = 0;
+    EllipsisChar = 0;
     EllipsisWidth = EllipsisCharStep = 0.0f;
     EllipsisCharCount = 0;
     FallbackGlyph = NULL;
@@ -3681,7 +3678,7 @@ static ImWchar FindFirstExistingGlyph(ImFont* font, const ImWchar* candidate_cha
     for (int n = 0; n < candidate_chars_count; n++)
         if (font->FindGlyphNoFallback(candidate_chars[n]) != NULL)
             return candidate_chars[n];
-    return (ImWchar)-1;
+    return 0;
 }
 
 void ImFont::BuildLookupTable()
@@ -3748,17 +3745,17 @@ void ImFont::BuildLookupTable()
     // Setup Ellipsis character. It is required for rendering elided text. We prefer using U+2026 (horizontal ellipsis).
     // However some old fonts may contain ellipsis at U+0085. Here we auto-detect most suitable ellipsis character.
     // FIXME: Note that 0x2026 is rarely included in our font ranges. Because of this we are more likely to use three individual dots.
-    const ImWchar ellipsis_chars[] = { (ImWchar)0x2026, (ImWchar)0x0085 };
+    const ImWchar ellipsis_chars[] = { ConfigData->EllipsisChar, (ImWchar)0x2026, (ImWchar)0x0085 };
     const ImWchar dots_chars[] = { (ImWchar)'.', (ImWchar)0xFF0E };
-    if (EllipsisChar == (ImWchar)-1)
+    if (EllipsisChar == 0)
         EllipsisChar = FindFirstExistingGlyph(this, ellipsis_chars, IM_ARRAYSIZE(ellipsis_chars));
     const ImWchar dot_char = FindFirstExistingGlyph(this, dots_chars, IM_ARRAYSIZE(dots_chars));
-    if (EllipsisChar != (ImWchar)-1)
+    if (EllipsisChar != 0)
     {
         EllipsisCharCount = 1;
         EllipsisWidth = EllipsisCharStep = FindGlyph(EllipsisChar)->X1;
     }
-    else if (dot_char != (ImWchar)-1)
+    else if (dot_char != 0)
     {
         const ImFontGlyph* glyph = FindGlyph(dot_char);
         EllipsisChar = dot_char;

imgui_internal.h

@@ -1,4 +1,4 @@
-// dear imgui, v1.91.6
+// dear imgui, v1.91.7 WIP
 // (internal structures/api)
 
 // You may use this file to debug, understand or extend Dear ImGui features but we don't provide any guarantee of forward compatibility.
@@ -1132,8 +1132,10 @@ struct IMGUI_API ImGuiInputTextState
 {
     ImGuiContext*           Ctx;                    // parent UI context (needs to be set explicitly by parent).
     ImStbTexteditState*     Stb;                    // State for stb_textedit.h
+    ImGuiInputTextFlags     Flags;                  // copy of InputText() flags. may be used to check if e.g. ImGuiInputTextFlags_Password is set.
     ImGuiID                 ID;                     // widget id owning the text state
     int                     TextLen;                // UTF-8 length of the string in TextA (in bytes)
+    const char*             TextSrc;                // == TextA.Data unless read-only, in which case == buf passed to InputText(). Field only set and valid _inside_ the call InputText() call.
     ImVector<char>          TextA;                  // main UTF8 buffer. TextA.Size is a buffer size! Should always be >= buf_size passed by user (and of course >= CurLenA + 1).
     ImVector<char>          TextToRevertTo;         // value to revert to when pressing Escape = backup of end-user buffer at the time of focus (in UTF-8, unaltered)
     ImVector<char>          CallbackTextBackup;     // temporary storage for callback to support automatic reconcile of undo-stack
@@ -1143,9 +1145,8 @@ struct IMGUI_API ImGuiInputTextState
     bool                    CursorFollow;           // set when we want scrolling to follow the current cursor position (not always!)
     bool                    SelectedAllMouseLock;   // after a double-click to select all, we ignore further mouse drags to update selection
     bool                    Edited;                 // edited this frame
-    ImGuiInputTextFlags     Flags;                  // copy of InputText() flags. may be used to check if e.g. ImGuiInputTextFlags_Password is set.
-    bool                    ReloadUserBuf;          // force a reload of user buf so it may be modified externally. may be automatic in future version.
-    int                     ReloadSelectionStart;   // POSITIONS ARE IN IMWCHAR units *NOT* UTF-8 this is why this is not exposed yet.
+    bool                    WantReloadUserBuf;      // force a reload of user buf so it may be modified externally. may be automatic in future version.
+    int                     ReloadSelectionStart;
     int                     ReloadSelectionEnd;
 
     ImGuiInputTextState();
@@ -2304,6 +2305,7 @@ struct ImGuiContext
     bool                    ActiveIdPreviousFrameIsAlive;
     bool                    ActiveIdPreviousFrameHasBeenEditedBefore;
     ImGuiWindow*            ActiveIdPreviousFrameWindow;
+    ImGuiDataTypeStorage    ActiveIdValueOnActivation;          // Backup of initial value at the time of activation. ONLY SET BY SPECIFIC WIDGETS: DragXXX and SliderXXX.
     ImGuiID                 LastActiveId;                       // Store the last non-zero ActiveId, useful for animation.
     float                   LastActiveIdTimer;                  // Store the last non-zero ActiveId timer since the beginning of activation, useful for animation.
 

imgui_tables.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.91.6
+// dear imgui, v1.91.7 WIP
 // (tables and columns code)
 
 /*

imgui_widgets.cpp

@@ -1,4 +1,4 @@
-// dear imgui, v1.91.6
+// dear imgui, v1.91.7 WIP
 // (widgets code)
 
 /*
@@ -2440,9 +2440,9 @@ bool ImGui::DragBehaviorT(ImGuiDataType data_type, TYPE* v, float v_speed, const
     if (g.ActiveIdSource == ImGuiInputSource_Mouse && IsMousePosValid() && IsMouseDragPastThreshold(0, g.IO.MouseDragThreshold * DRAG_MOUSE_THRESHOLD_FACTOR))
     {
         adjust_delta = g.IO.MouseDelta[axis];
-        if (g.IO.KeyAlt)
+        if (g.IO.KeyAlt && !(flags & ImGuiSliderFlags_NoSpeedTweaks))
             adjust_delta *= 1.0f / 100.0f;
-        if (g.IO.KeyShift)
+        if (g.IO.KeyShift && !(flags & ImGuiSliderFlags_NoSpeedTweaks))
             adjust_delta *= 10.0f;
     }
     else if (g.ActiveIdSource == ImGuiInputSource_Keyboard || g.ActiveIdSource == ImGuiInputSource_Gamepad)
@@ -2450,7 +2450,7 @@ bool ImGui::DragBehaviorT(ImGuiDataType data_type, TYPE* v, float v_speed, const
         const int decimal_precision = is_floating_point ? ImParseFormatPrecision(format, 3) : 0;
         const bool tweak_slow = IsKeyDown((g.NavInputSource == ImGuiInputSource_Gamepad) ? ImGuiKey_NavGamepadTweakSlow : ImGuiKey_NavKeyboardTweakSlow);
         const bool tweak_fast = IsKeyDown((g.NavInputSource == ImGuiInputSource_Gamepad) ? ImGuiKey_NavGamepadTweakFast : ImGuiKey_NavKeyboardTweakFast);
-        const float tweak_factor = tweak_slow ? 1.0f / 10.0f : tweak_fast ? 10.0f : 1.0f;
+        const float tweak_factor = (flags & ImGuiSliderFlags_NoSpeedTweaks) ? 1.0f : tweak_slow ? 1.0f / 10.0f : tweak_fast ? 10.0f : 1.0f;
         adjust_delta = GetNavTweakPressedAmount(axis) * tweak_factor;
         v_speed = ImMax(v_speed, GetMinimumStepAtDecimalPrecision(decimal_precision));
     }
@@ -2638,6 +2638,10 @@ bool ImGui::DragScalar(const char* label, ImGuiDataType data_type, void* p_data,
                 temp_input_is_active = true;
             }
 
+        // Store initial value (not used by main lib but available as a convenience but some mods e.g. to revert)
+        if (make_active)
+            memcpy(&g.ActiveIdValueOnActivation, p_data, DataTypeGetInfo(data_type)->Size);
+
         if (make_active && !temp_input_is_active)
         {
             SetActiveID(id, window);
@@ -3228,6 +3232,10 @@ bool ImGui::SliderScalar(const char* label, ImGuiDataType data_type, void* p_dat
             if ((clicked && g.IO.KeyCtrl) || (g.NavActivateId == id && (g.NavActivateFlags & ImGuiActivateFlags_PreferInput)))
                 temp_input_is_active = true;
 
+        // Store initial value (not used by main lib but available as a convenience but some mods e.g. to revert)
+        if (make_active)
+            memcpy(&g.ActiveIdValueOnActivation, p_data, DataTypeGetInfo(data_type)->Size);
+
         if (make_active && !temp_input_is_active)
         {
             SetActiveID(id, window);
@@ -3936,12 +3944,12 @@ static ImVec2 InputTextCalcTextSize(ImGuiContext* ctx, const char* text_begin, c
 namespace ImStb
 {
 static int     STB_TEXTEDIT_STRINGLEN(const ImGuiInputTextState* obj)                             { return obj->TextLen; }
-static char    STB_TEXTEDIT_GETCHAR(const ImGuiInputTextState* obj, int idx)                      { IM_ASSERT(idx <= obj->TextLen); return obj->TextA[idx]; }
-static float   STB_TEXTEDIT_GETWIDTH(ImGuiInputTextState* obj, int line_start_idx, int char_idx)  { unsigned int c; ImTextCharFromUtf8(&c, obj->TextA.Data + line_start_idx + char_idx, obj->TextA.Data + obj->TextLen); if ((ImWchar)c == '\n') return IMSTB_TEXTEDIT_GETWIDTH_NEWLINE; ImGuiContext& g = *obj->Ctx; return g.Font->GetCharAdvance((ImWchar)c) * g.FontScale; }
+static char    STB_TEXTEDIT_GETCHAR(const ImGuiInputTextState* obj, int idx)                      { IM_ASSERT(idx <= obj->TextLen); return obj->TextSrc[idx]; }
+static float   STB_TEXTEDIT_GETWIDTH(ImGuiInputTextState* obj, int line_start_idx, int char_idx)  { unsigned int c; ImTextCharFromUtf8(&c, obj->TextSrc + line_start_idx + char_idx, obj->TextSrc + obj->TextLen); if ((ImWchar)c == '\n') return IMSTB_TEXTEDIT_GETWIDTH_NEWLINE; ImGuiContext& g = *obj->Ctx; return g.Font->GetCharAdvance((ImWchar)c) * g.FontScale; }
 static char    STB_TEXTEDIT_NEWLINE = '\n';
 static void    STB_TEXTEDIT_LAYOUTROW(StbTexteditRow* r, ImGuiInputTextState* obj, int line_start_idx)
 {
-    const char* text = obj->TextA.Data;
+    const char* text = obj->TextSrc;
     const char* text_remaining = NULL;
     const ImVec2 size = InputTextCalcTextSize(obj->Ctx, text + line_start_idx, text + obj->TextLen, &text_remaining, NULL, true);
     r->x0 = 0.0f;
@@ -3960,15 +3968,15 @@ static int IMSTB_TEXTEDIT_GETNEXTCHARINDEX_IMPL(ImGuiInputTextState* obj, int id
     if (idx >= obj->TextLen)
         return obj->TextLen + 1;
     unsigned int c;
-    return idx + ImTextCharFromUtf8(&c, obj->TextA.Data + idx, obj->TextA.Data + obj->TextLen);
+    return idx + ImTextCharFromUtf8(&c, obj->TextSrc + idx, obj->TextSrc + obj->TextLen);
 }
 
 static int IMSTB_TEXTEDIT_GETPREVCHARINDEX_IMPL(ImGuiInputTextState* obj, int idx)
 {
     if (idx <= 0)
         return -1;
-    const char* p = ImTextFindPreviousUtf8Codepoint(obj->TextA.Data, obj->TextA.Data + idx);
-    return (int)(p - obj->TextA.Data);
+    const char* p = ImTextFindPreviousUtf8Codepoint(obj->TextSrc, obj->TextSrc + idx);
+    return (int)(p - obj->TextSrc);
 }
 
 static bool ImCharIsSeparatorW(unsigned int c)
@@ -3991,10 +3999,10 @@ static int is_word_boundary_from_right(ImGuiInputTextState* obj, int idx)
     if ((obj->Flags & ImGuiInputTextFlags_Password) || idx <= 0)
         return 0;
 
-    const char* curr_p = obj->TextA.Data + idx;
-    const char* prev_p = ImTextFindPreviousUtf8Codepoint(obj->TextA.Data, curr_p);
-    unsigned int curr_c; ImTextCharFromUtf8(&curr_c, curr_p, obj->TextA.Data + obj->TextLen);
-    unsigned int prev_c; ImTextCharFromUtf8(&prev_c, prev_p, obj->TextA.Data + obj->TextLen);
+    const char* curr_p = obj->TextSrc + idx;
+    const char* prev_p = ImTextFindPreviousUtf8Codepoint(obj->TextSrc, curr_p);
+    unsigned int curr_c; ImTextCharFromUtf8(&curr_c, curr_p, obj->TextSrc + obj->TextLen);
+    unsigned int prev_c; ImTextCharFromUtf8(&prev_c, prev_p, obj->TextSrc + obj->TextLen);
 
     bool prev_white = ImCharIsBlankW(prev_c);
     bool prev_separ = ImCharIsSeparatorW(prev_c);
@@ -4007,10 +4015,10 @@ static int is_word_boundary_from_left(ImGuiInputTextState* obj, int idx)
     if ((obj->Flags & ImGuiInputTextFlags_Password) || idx <= 0)
         return 0;
 
-    const char* curr_p = obj->TextA.Data + idx;
-    const char* prev_p = ImTextFindPreviousUtf8Codepoint(obj->TextA.Data, curr_p);
-    unsigned int prev_c; ImTextCharFromUtf8(&prev_c, curr_p, obj->TextA.Data + obj->TextLen);
-    unsigned int curr_c; ImTextCharFromUtf8(&curr_c, prev_p, obj->TextA.Data + obj->TextLen);
+    const char* curr_p = obj->TextSrc + idx;
+    const char* prev_p = ImTextFindPreviousUtf8Codepoint(obj->TextSrc, curr_p);
+    unsigned int prev_c; ImTextCharFromUtf8(&prev_c, curr_p, obj->TextSrc + obj->TextLen);
+    unsigned int curr_c; ImTextCharFromUtf8(&curr_c, prev_p, obj->TextSrc + obj->TextLen);
 
     bool prev_white = ImCharIsBlankW(prev_c);
     bool prev_separ = ImCharIsSeparatorW(prev_c);
@@ -4047,16 +4055,13 @@ static int  STB_TEXTEDIT_MOVEWORDRIGHT_IMPL(ImGuiInputTextState* obj, int idx)
 
 static void STB_TEXTEDIT_DELETECHARS(ImGuiInputTextState* obj, int pos, int n)
 {
+    // Offset remaining text (+ copy zero terminator)
+    IM_ASSERT(obj->TextSrc == obj->TextA.Data);
     char* dst = obj->TextA.Data + pos;
-
+    char* src = obj->TextA.Data + pos + n;
+    memmove(dst, src, obj->TextLen - n - pos + 1);
     obj->Edited = true;
     obj->TextLen -= n;
-
-    // Offset remaining text (FIXME-OPT: Use memmove)
-    const char* src = obj->TextA.Data + pos + n;
-    while (char c = *src++)
-        *dst++ = c;
-    *dst = '\0';
 }
 
 static bool STB_TEXTEDIT_INSERTCHARS(ImGuiInputTextState* obj, int pos, const char* new_text, int new_text_len)
@@ -4069,11 +4074,13 @@ static bool STB_TEXTEDIT_INSERTCHARS(ImGuiInputTextState* obj, int pos, const ch
         return false;
 
     // Grow internal buffer if needed
+    IM_ASSERT(obj->TextSrc == obj->TextA.Data);
     if (new_text_len + text_len + 1 > obj->TextA.Size)
     {
         if (!is_resizable)
             return false;
         obj->TextA.resize(text_len + ImClamp(new_text_len, 32, ImMax(256, new_text_len)) + 1);
+        obj->TextSrc = obj->TextA.Data;
     }
 
     char* text = obj->TextA.Data;
@@ -4171,26 +4178,25 @@ int  ImGuiInputTextState::GetCursorPos() const              { return Stb->cursor
 int  ImGuiInputTextState::GetSelectionStart() const         { return Stb->select_start; }
 int  ImGuiInputTextState::GetSelectionEnd() const           { return Stb->select_end; }
 void ImGuiInputTextState::SelectAll()                       { Stb->select_start = 0; Stb->cursor = Stb->select_end = TextLen; Stb->has_preferred_x = 0; }
-void ImGuiInputTextState::ReloadUserBufAndSelectAll()       { ReloadUserBuf = true; ReloadSelectionStart = 0; ReloadSelectionEnd = INT_MAX; }
-void ImGuiInputTextState::ReloadUserBufAndKeepSelection()   { ReloadUserBuf = true; ReloadSelectionStart = Stb->select_start; ReloadSelectionEnd = Stb->select_end; }
-void ImGuiInputTextState::ReloadUserBufAndMoveToEnd()       { ReloadUserBuf = true; ReloadSelectionStart = ReloadSelectionEnd = INT_MAX; }
+void ImGuiInputTextState::ReloadUserBufAndSelectAll()       { WantReloadUserBuf = true; ReloadSelectionStart = 0; ReloadSelectionEnd = INT_MAX; }
+void ImGuiInputTextState::ReloadUserBufAndKeepSelection()   { WantReloadUserBuf = true; ReloadSelectionStart = Stb->select_start; ReloadSelectionEnd = Stb->select_end; }
+void ImGuiInputTextState::ReloadUserBufAndMoveToEnd()       { WantReloadUserBuf = true; ReloadSelectionStart = ReloadSelectionEnd = INT_MAX; }
 
 ImGuiInputTextCallbackData::ImGuiInputTextCallbackData()
 {
     memset(this, 0, sizeof(*this));
 }
 
-// Public API to manipulate UTF-8 text
-// We expose UTF-8 to the user (unlike the STB_TEXTEDIT_* functions which are manipulating wchar)
+// Public API to manipulate UTF-8 text from within a callback.
 // FIXME: The existence of this rarely exercised code path is a bit of a nuisance.
+// Historically they existed because STB_TEXTEDIT_INSERTCHARS() etc. worked on our ImWchar
+// buffer, but nowadays they both work on UTF-8 data. Should aim to merge both.
 void ImGuiInputTextCallbackData::DeleteChars(int pos, int bytes_count)
 {
     IM_ASSERT(pos + bytes_count <= BufTextLen);
     char* dst = Buf + pos;
     const char* src = Buf + pos + bytes_count;
-    while (char c = *src++)
-        *dst++ = c;
-    *dst = '\0';
+    memmove(dst, src, BufTextLen - bytes_count - pos + 1);
 
     if (CursorPos >= pos + bytes_count)
         CursorPos -= bytes_count;
@@ -4215,13 +4221,13 @@ void ImGuiInputTextCallbackData::InsertChars(int pos, const char* new_text, cons
         if (!is_resizable)
             return;
 
-        // Contrary to STB_TEXTEDIT_INSERTCHARS() this is working in the UTF8 buffer, hence the mildly similar code (until we remove the U16 buffer altogether!)
         ImGuiContext& g = *Ctx;
         ImGuiInputTextState* edit_state = &g.InputTextState;
         IM_ASSERT(edit_state->ID != 0 && g.ActiveId == edit_state->ID);
         IM_ASSERT(Buf == edit_state->TextA.Data);
         int new_buf_size = BufTextLen + ImClamp(new_text_len * 4, 32, ImMax(256, new_text_len)) + 1;
         edit_state->TextA.resize(new_buf_size + 1);
+        edit_state->TextSrc = edit_state->TextA.Data;
         Buf = edit_state->TextA.Data;
         BufSize = edit_state->BufCapacity = new_buf_size;
     }
@@ -4339,26 +4345,23 @@ static bool InputTextFilterCharacter(ImGuiContext* ctx, unsigned int* p_char, Im
     return true;
 }
 
-// Find the shortest single replacement we can make to get the new text from the old text.
-// Important: needs to be run before TextW is rewritten with the new characters because calling STB_TEXTEDIT_GETCHAR() at the end.
+// Find the shortest single replacement we can make to get from old_buf to new_buf
+// Note that this doesn't directly alter state->TextA, state->TextLen. They are expected to be made valid separately.
 // FIXME: Ideally we should transition toward (1) making InsertChars()/DeleteChars() update undo-stack (2) discourage (and keep reconcile) or obsolete (and remove reconcile) accessing buffer directly.
-static void InputTextReconcileUndoStateAfterUserCallback(ImGuiInputTextState* state, const char* new_buf_a, int new_length_a)
+static void InputTextReconcileUndoState(ImGuiInputTextState* state, const char* old_buf, int old_length, const char* new_buf, int new_length)
 {
-    const char* old_buf = state->CallbackTextBackup.Data;
-    const int old_length = state->CallbackTextBackup.Size - 1;
-
-    const int shorter_length = ImMin(old_length, new_length_a);
+    const int shorter_length = ImMin(old_length, new_length);
     int first_diff;
     for (first_diff = 0; first_diff < shorter_length; first_diff++)
-        if (old_buf[first_diff] != new_buf_a[first_diff])
+        if (old_buf[first_diff] != new_buf[first_diff])
             break;
-    if (first_diff == old_length && first_diff == new_length_a)
+    if (first_diff == old_length && first_diff == new_length)
         return;
 
     int old_last_diff = old_length   - 1;
-    int new_last_diff = new_length_a - 1;
+    int new_last_diff = new_length - 1;
     for (; old_last_diff >= first_diff && new_last_diff >= first_diff; old_last_diff--, new_last_diff--)
-        if (old_buf[old_last_diff] != new_buf_a[new_last_diff])
+        if (old_buf[old_last_diff] != new_buf[new_last_diff])
             break;
 
     const int insert_len = new_last_diff - first_diff + 1;
@@ -4510,64 +4513,65 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
 
     float scroll_y = is_multiline ? draw_window->Scroll.y : FLT_MAX;
 
-    const bool init_reload_from_user_buf = (state != NULL && state->ReloadUserBuf);
+    const bool init_reload_from_user_buf = (state != NULL && state->WantReloadUserBuf);
     const bool init_changed_specs = (state != NULL && state->Stb->single_line != !is_multiline); // state != NULL means its our state.
     const bool init_make_active = (user_clicked || user_scroll_finish || input_requested_by_nav);
     const bool init_state = (init_make_active || user_scroll_active);
-    if ((init_state && g.ActiveId != id) || init_changed_specs || init_reload_from_user_buf)
+    if (init_reload_from_user_buf)
+    {
+        int new_len = (int)strlen(buf);
+        state->WantReloadUserBuf = false;
+        InputTextReconcileUndoState(state, state->TextA.Data, state->TextLen, buf, new_len);
+        state->TextA.resize(buf_size + 1); // we use +1 to make sure that .Data is always pointing to at least an empty string.
+        state->TextLen = new_len;
+        memcpy(state->TextA.Data, buf, state->TextLen + 1);
+        state->Stb->select_start = state->ReloadSelectionStart;
+        state->Stb->cursor = state->Stb->select_end = state->ReloadSelectionEnd;
+        state->CursorClamp();
+    }
+    else if ((init_state && g.ActiveId != id) || init_changed_specs)
     {
         // Access state even if we don't own it yet.
         state = &g.InputTextState;
         state->CursorAnimReset();
-        state->ReloadUserBuf = false;
 
         // Backup state of deactivating item so they'll have a chance to do a write to output buffer on the same frame they report IsItemDeactivatedAfterEdit (#4714)
         InputTextDeactivateHook(state->ID);
 
+        // Take a copy of the initial buffer value.
         // From the moment we focused we are normally ignoring the content of 'buf' (unless we are in read-only mode)
         const int buf_len = (int)strlen(buf);
-        if (!init_reload_from_user_buf)
-        {
-            // Take a copy of the initial buffer value.
-            state->TextToRevertTo.resize(buf_len + 1);    // UTF-8. we use +1 to make sure that .Data is always pointing to at least an empty string.
-            memcpy(state->TextToRevertTo.Data, buf, buf_len + 1);
-        }
+        state->TextToRevertTo.resize(buf_len + 1);    // UTF-8. we use +1 to make sure that .Data is always pointing to at least an empty string.
+        memcpy(state->TextToRevertTo.Data, buf, buf_len + 1);
 
         // Preserve cursor position and undo/redo stack if we come back to same widget
         // FIXME: Since we reworked this on 2022/06, may want to differentiate recycle_cursor vs recycle_undostate?
-        bool recycle_state = (state->ID == id && !init_changed_specs && !init_reload_from_user_buf);
-        if (recycle_state && (state->TextLen != buf_len || (strncmp(state->TextA.Data, buf, buf_len) != 0)))
+        bool recycle_state = (state->ID == id && !init_changed_specs);
+        if (recycle_state && (state->TextLen != buf_len || (state->TextA.Data == NULL || strncmp(state->TextA.Data, buf, buf_len) != 0)))
             recycle_state = false;
 
         // Start edition
         state->ID = id;
-        state->TextA.resize(buf_size + 1);          // we use +1 to make sure that .Data is always pointing to at least an empty string.
         state->TextLen = (int)strlen(buf);
-        memcpy(state->TextA.Data, buf, state->TextLen + 1);
+        if (!is_readonly)
+        {
+            state->TextA.resize(buf_size + 1); // we use +1 to make sure that .Data is always pointing to at least an empty string.
+            memcpy(state->TextA.Data, buf, state->TextLen + 1);
+        }
 
         // Find initial scroll position for right alignment
         state->Scroll = ImVec2(0.0f, 0.0f);
         if (flags & ImGuiInputTextFlags_ElideLeft)
             state->Scroll.x += ImMax(0.0f, CalcTextSize(buf).x - frame_size.x + style.FramePadding.x * 2.0f);
 
+        // Recycle existing cursor/selection/undo stack but clamp position
+        // Note a single mouse click will override the cursor/position immediately by calling stb_textedit_click handler.
         if (recycle_state)
-        {
-            // Recycle existing cursor/selection/undo stack but clamp position
-            // Note a single mouse click will override the cursor/position immediately by calling stb_textedit_click handler.
             state->CursorClamp();
-        }
         else
-        {
             stb_textedit_initialize_state(state->Stb, !is_multiline);
-        }
 
-        if (init_reload_from_user_buf)
-        {
-            state->Stb->select_start = state->ReloadSelectionStart;
-            state->Stb->cursor = state->Stb->select_end = state->ReloadSelectionEnd;
-            state->CursorClamp();
-        }
-        else if (!is_multiline)
+        if (!is_multiline)
         {
             if (flags & ImGuiInputTextFlags_AutoSelectAll)
                 select_all = true;
@@ -4617,7 +4621,15 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
         // Expose scroll in a manner that is agnostic to us using a child window
         if (is_multiline && state != NULL)
             state->Scroll.y = draw_window->Scroll.y;
+
+        // Read-only mode always ever read from source buffer. Refresh TextLen when active.
+        if (is_readonly && state != NULL)
+            state->TextLen = (int)strlen(buf);
+        //if (is_readonly && state != NULL)
+        //    state->TextA.clear(); // Uncomment to facilitate debugging, but we otherwise prefer to keep/amortize th allocation.
     }
+    if (state != NULL)
+        state->TextSrc = is_readonly ? buf : state->TextA.Data;
 
     // We have an edge case if ActiveId was set through another widget (e.g. widget being swapped), clear id immediately (don't wait until the end of the function)
     if (g.ActiveId == id && state == NULL)
@@ -4882,13 +4894,13 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
             // Cut, Copy
             if (g.PlatformIO.Platform_SetClipboardTextFn != NULL)
             {
+                // SetClipboardText() only takes null terminated strings + state->TextSrc may point to read-only user buffer, so we need to make a copy.
                 const int ib = state->HasSelection() ? ImMin(state->Stb->select_start, state->Stb->select_end) : 0;
                 const int ie = state->HasSelection() ? ImMax(state->Stb->select_start, state->Stb->select_end) : state->TextLen;
-
-                char backup = state->TextA.Data[ie];
-                state->TextA.Data[ie] = 0; // A bit of a hack since SetClipboardText only takes null terminated strings
-                SetClipboardText(state->TextA.Data + ib);
-                state->TextA.Data[ie] = backup;
+                g.TempBuffer.reserve(ie - ib + 1);
+                memcpy(g.TempBuffer.Data, state->TextSrc, ie - ib);
+                g.TempBuffer.Data[ie] = 0;
+                SetClipboardText(g.TempBuffer.Data);
             }
             if (is_cut)
             {
@@ -4904,25 +4916,27 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
             {
                 // Filter pasted buffer
                 const int clipboard_len = (int)strlen(clipboard);
-                char* clipboard_filtered = (char*)IM_ALLOC(clipboard_len + 1);
-                int clipboard_filtered_len = 0;
+                ImVector<char> clipboard_filtered;
+                clipboard_filtered.reserve(clipboard_len + 1);
                 for (const char* s = clipboard; *s != 0; )
                 {
                     unsigned int c;
-                    int len = ImTextCharFromUtf8(&c, s, NULL);
-                    s += len;
+                    int in_len = ImTextCharFromUtf8(&c, s, NULL);
+                    s += in_len;
                     if (!InputTextFilterCharacter(&g, &c, flags, callback, callback_user_data, true))
                         continue;
-                    memcpy(clipboard_filtered + clipboard_filtered_len, s - len, len);
-                    clipboard_filtered_len += len;
+                    char c_utf8[5];
+                    ImTextCharToUtf8(c_utf8, c);
+                    int out_len = (int)strlen(c_utf8);
+                    clipboard_filtered.resize(clipboard_filtered.Size + out_len);
+                    memcpy(clipboard_filtered.Data + clipboard_filtered.Size - out_len, c_utf8, out_len);
                 }
-                clipboard_filtered[clipboard_filtered_len] = 0;
-                if (clipboard_filtered_len > 0) // If everything was filtered, ignore the pasting operation
+                if (clipboard_filtered.Size > 0) // If everything was filtered, ignore the pasting operation
                 {
-                    stb_textedit_paste(state, state->Stb, clipboard_filtered, clipboard_filtered_len);
+                    clipboard_filtered.push_back(0);
+                    stb_textedit_paste(state, state->Stb, clipboard_filtered.Data, clipboard_filtered.Size - 1);
                     state->CursorFollow = true;
                 }
-                MemFree(clipboard_filtered);
             }
         }
 
@@ -5015,10 +5029,11 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
                     callback_data.UserData = callback_user_data;
 
                     // FIXME-OPT: Undo stack reconcile needs a backup of the data until we rework API, see #7925
+                    char* callback_buf = is_readonly ? buf : state->TextA.Data;
+                    IM_ASSERT(callback_buf == state->TextSrc);
                     state->CallbackTextBackup.resize(state->TextLen + 1);
-                    memcpy(state->CallbackTextBackup.Data, state->TextA.Data, state->TextLen + 1);
+                    memcpy(state->CallbackTextBackup.Data, callback_buf, state->TextLen + 1);
 
-                    char* callback_buf = is_readonly ? buf : state->TextA.Data;
                     callback_data.EventKey = event_key;
                     callback_data.Buf = callback_buf;
                     callback_data.BufTextLen = state->TextLen;
@@ -5045,7 +5060,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
                     {
                         // Callback may update buffer and thus set buf_dirty even in read-only mode.
                         IM_ASSERT(callback_data.BufTextLen == (int)strlen(callback_data.Buf)); // You need to maintain BufTextLen if you change the text!
-                        InputTextReconcileUndoStateAfterUserCallback(state, callback_data.Buf, callback_data.BufTextLen); // FIXME: Move the rest of this block inside function and rename to InputTextReconcileStateAfterUserCallback() ?
+                        InputTextReconcileUndoState(state, state->CallbackTextBackup.Data, state->CallbackTextBackup.Size - 1, callback_data.Buf, callback_data.BufTextLen);
                         state->TextLen = callback_data.BufTextLen;  // Assume correct length and valid UTF-8 from user, saves us an extra strlen()
                         state->CursorAnimReset();
                     }
@@ -5053,9 +5068,9 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
             }
 
             // Will copy result string if modified
-            if (!is_readonly && strcmp(state->TextA.Data, buf) != 0)
+            if (!is_readonly && strcmp(state->TextSrc, buf) != 0)
             {
-                apply_new_text = state->TextA.Data;
+                apply_new_text = state->TextSrc;
                 apply_new_text_length = state->TextLen;
                 value_changed = true;
             }
@@ -5149,7 +5164,7 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
         // - Measure text height (for scrollbar)
         // We are attempting to do most of that in **one main pass** to minimize the computation cost (non-negligible for large amount of text) + 2nd pass for selection rendering (we could merge them by an extra refactoring effort)
         // FIXME: This should occur on buf_display but we'd need to maintain cursor/select_start/select_end for UTF-8.
-        const char* text_begin = state->TextA.Data;
+        const char* text_begin = buf_display;
         const char* text_end = text_begin + state->TextLen;
         ImVec2 cursor_offset, select_start_offset;
 
@@ -5330,6 +5345,8 @@ bool ImGui::InputTextEx(const char* label, const char* hint, char* buf, int buf_
             g.LastItemData.StatusFlags = item_data_backup.StatusFlags;
         }
     }
+    if (state)
+        state->TextSrc = NULL;
 
     // Log as text
     if (g.LogEnabled && (!is_password || is_displaying_hint))
@@ -8213,15 +8230,10 @@ void ImGuiSelectionExternalStorage::ApplyRequests(ImGuiMultiSelectIO* ms_io)
 //-------------------------------------------------------------------------
 
 // This is essentially a thin wrapper to using BeginChild/EndChild with the ImGuiChildFlags_FrameStyle flag for stylistic changes + displaying a label.
-// This handle some subtleties with capturing info from the label, but for 99% uses it could essentially be rewritten as:
-//    if (ImGui::BeginChild("...", ImVec2(ImGui::CalcItemWidth(), ImGui::GetTextLineHeight() * 7.5f), ImGuiChildFlags_FrameStyle))
-//        { .... }
-//    ImGui::EndChild();
-//    ImGui::SameLine();
-//    ImGui::AlignTextToFramePadding();
-//    ImGui::Text("Label");
+// This handle some subtleties with capturing info from the label.
+// If you don't need a label you can pretty much directly use ImGui::BeginChild() with ImGuiChildFlags_FrameStyle.
 // Tip: To have a list filling the entire window width, use size.x = -FLT_MIN and pass an non-visible label e.g. "##empty"
-// Tip: If your vertical size is calculated from an item count (e.g. 10 * item_height) consider adding a fractional part to facilitate seeing scrolling boundaries (e.g. 10.25 * item_height).
+// Tip: If your vertical size is calculated from an item count (e.g. 10 * item_height) consider adding a fractional part to facilitate seeing scrolling boundaries (e.g. 10.5f * item_height).
 bool ImGui::BeginListBox(const char* label, const ImVec2& size_arg)
 {
     ImGuiContext& g = *GImGui;