Misc renaming, comments. Docs: add missing spacing to Changelog.

docs/CHANGELOG.txt

@@ -8,6 +8,7 @@ Changes to the examples/bindings are included within the individual .cpp files i
 RELEASE NOTES:                  https://github.com/ocornut/imgui/releases
 REPORT ISSUES, ASK QUESTIONS:   https://github.com/ocornut/imgui/issues
 COMMITS HISTORY:                https://github.com/ocornut/imgui/commits/master
+FAQ                             https://www.dearimgui.org/faq/
 
 WHEN TO UPDATE?
 
@@ -34,6 +35,7 @@ HOW TO UPDATE?
 -----------------------------------------------------------------------
 
 Breaking Changes:
+
 - Removed redirecting functions/enums names that were marked obsolete in 1.53 (December 2017):
   - ShowTestWindow()                    -> use ShowDemoWindow()
   - IsRootWindowFocused()               -> use IsWindowFocused(ImGuiFocusedFlags_RootWindow)
@@ -63,6 +65,7 @@ Breaking Changes:
   adding multiple points into it, you may need to fix your initial value.
 
 Other Changes:
+
 - Inputs: Added ImGuiMouseButton enum for convenience (e.g. ImGuiMouseButton_Right=1).
   We forever guarantee that the existing value will not changes so existing code is free to use 0/1/2.
 - ColorEdit: Fix label alignment when using ImGuiColorEditFlags_NoInputs. (#2955) [@rokups]
@@ -118,6 +121,7 @@ Other Changes:
 Decorated log: https://github.com/ocornut/imgui/releases/tag/v1.74
 
 Breaking Changes:
+
 - Removed redirecting functions/enums names that were marked obsolete in 1.52 (October 2017):
   - Begin() [old 5 args version]     -> use Begin() [3 args], use SetNextWindowSize() SetNextWindowBgAlpha() if needed
   - IsRootWindowOrAnyChildHovered()  -> use IsWindowHovered(ImGuiHoveredFlags_RootAndChildWindows)
@@ -142,6 +146,7 @@ Breaking Changes:
   The value is unused in master branch but will be used by the multi-viewport feature. (#2851) [@obfuscate]
 
 Other Changes:
+
 - InputText, Nav: Fixed Home/End key broken when activating Keyboard Navigation. (#787)
 - InputText: Filter out ASCII 127 (DEL) emitted by low-level OSX layer, as we are using the Key value. (#2578)
 - Layout: Fixed a couple of subtle bounding box vertical positioning issues relating to the handling of text
@@ -274,6 +279,7 @@ Other Changes:
 Decorated log: https://github.com/ocornut/imgui/releases/tag/v1.72
 
 Breaking Changes:
+
 - Removed redirecting functions/enums names that were marked obsolete in 1.51 (June 2017):
   - ImGuiCol_Column*, ImGuiSetCond_* enums.
   - IsItemHoveredRect(), IsPosHoveringAnyWindow(), IsMouseHoveringAnyWindow(), IsMouseHoveringWindow() functions.
@@ -285,6 +291,7 @@ Breaking Changes:
   Kept redirection function (will obsolete). (#581, #324)
 
 Other Changes:
+
 - Scrolling: Made mouse-wheel scrolling lock the underlying window until the mouse is moved again or
   until a short delay expires (~2 seconds). This allow uninterrupted scroll even if child windows are
   passing under the mouse cursor. (#2604)
@@ -357,6 +364,7 @@ Other Changes:
 Decorated log: https://github.com/ocornut/imgui/releases/tag/v1.71
 
 Breaking Changes:
+
 - IO: changed AddInputCharacter(unsigned short c) signature to AddInputCharacter(unsigned int c).
 - Renamed SetNextTreeNodeOpen() to SetNextItemOpen(). Kept inline redirection function (will obsolete).
 - Window: rendering of child windows outer decorations (e.g. bg color, border, scrollbars) is now
@@ -367,6 +375,7 @@ Breaking Changes:
   to the creation of overlapping child windows. Please reach out if you are affected by this change!
 
 Other Changes:
+
 - Window: clarified behavior of SetNextWindowContentSize(). Content size is defined as the size available
   after removal of WindowPadding on each sides. So SetNextWindowContentSize(ImVec2(100,100)) + auto-resize
   will always allow submitting a 100x100 item without creating a scrollbar, regarding of WindowPadding.
@@ -439,6 +448,7 @@ Other Changes:
 Decorated log: https://github.com/ocornut/imgui/releases/tag/v1.70
 
 Breaking Changes:
+
 - ImDrawList: Improved algorithm for mitre joints on thick lines, preserving correct thickness
   up to 90 degrees angles (e.g. rectangles). If you have custom rendering using thick lines,
   they will appear a little thicker now. (#2518) [@rmitton]
@@ -451,6 +461,7 @@ Breaking Changes:
   on them but it is possible you have!).
 
 Other Changes:
+
 - ImDrawList: Added ImDrawCallback_ResetRenderState, a special ImDrawList::AddCallback() value
   to request the renderer back-end to reset its render state. (#2037, #1639, #2452)
   Examples: Added support for ImDrawCallback_ResetRenderState in all renderer back-ends. Each

imgui.cpp

@@ -3766,7 +3766,7 @@ void ImGui::NewFrame()
         window->Active = false;
         window->WriteAccessed = false;
 
-        // Garbage collect (this is totally functional but we may need decide if the side-effects are desirable)
+        // Garbage collect transient buffers of recently unused windows
         if (!window->WasActive && !window->MemoryCompacted && window->LastTimeActive < memory_compact_start_time)
             GcCompactTransientWindowBuffers(window);
     }
@@ -3887,7 +3887,7 @@ void ImGui::Shutdown(ImGuiContext* context)
         IM_DELETE(g.Windows[i]);
     g.Windows.clear();
     g.WindowsFocusOrder.clear();
-    g.WindowsSortBuffer.clear();
+    g.WindowsTempSortBuffer.clear();
     g.CurrentWindow = NULL;
     g.CurrentWindowStack.clear();
     g.WindowsById.Clear();
@@ -4123,19 +4123,19 @@ void ImGui::EndFrame()
 
     // Sort the window list so that all child windows are after their parent
     // We cannot do that on FocusWindow() because childs may not exist yet
-    g.WindowsSortBuffer.resize(0);
-    g.WindowsSortBuffer.reserve(g.Windows.Size);
+    g.WindowsTempSortBuffer.resize(0);
+    g.WindowsTempSortBuffer.reserve(g.Windows.Size);
     for (int i = 0; i != g.Windows.Size; i++)
     {
         ImGuiWindow* window = g.Windows[i];
         if (window->Active && (window->Flags & ImGuiWindowFlags_ChildWindow))       // if a child is active its parent will add it
             continue;
-        AddWindowToSortBuffer(&g.WindowsSortBuffer, window);
+        AddWindowToSortBuffer(&g.WindowsTempSortBuffer, window);
     }
 
     // This usually assert if there is a mismatch between the ImGuiWindowFlags_ChildWindow / ParentWindow values and DC.ChildWindows[] in parents, aka we've done something wrong.
-    IM_ASSERT(g.Windows.Size == g.WindowsSortBuffer.Size);
-    g.Windows.swap(g.WindowsSortBuffer);
+    IM_ASSERT(g.Windows.Size == g.WindowsTempSortBuffer.Size);
+    g.Windows.swap(g.WindowsTempSortBuffer);
     g.IO.MetricsActiveWindows = g.WindowsActiveCount;
 
     // Unlock font atlas
@@ -10119,6 +10119,7 @@ void ImGui::ShowMetricsWindow(bool* p_open)
     };
 
     Funcs::NodeWindows(g.Windows, "Windows");
+    //Funcs::NodeWindows(g.WindowsFocusOrder, "WindowsFocusOrder");
     if (ImGui::TreeNode("DrawLists", "Active DrawLists (%d)", g.DrawDataBuilder.Layers[0].Size))
     {
         for (int i = 0; i < g.DrawDataBuilder.Layers[0].Size; i++)

imgui_demo.cpp

@@ -1790,7 +1790,7 @@ static void ShowDemoWindowLayout()
         // Child 1: no border, enable horizontal scrollbar
         {
             ImGuiWindowFlags window_flags = ImGuiWindowFlags_HorizontalScrollbar | (disable_mouse_wheel ? ImGuiWindowFlags_NoScrollWithMouse : 0);
-            ImGui::BeginChild("Child1", ImVec2(ImGui::GetWindowContentRegionWidth() * 0.5f, 260), false, window_flags);
+            ImGui::BeginChild("ChildL", ImVec2(ImGui::GetWindowContentRegionWidth() * 0.5f, 260), false, window_flags);
             for (int i = 0; i < 100; i++)
             {
                 ImGui::Text("%04d: scrollable region", i);
@@ -1808,7 +1808,7 @@ static void ShowDemoWindowLayout()
         {
             ImGuiWindowFlags window_flags = (disable_mouse_wheel ? ImGuiWindowFlags_NoScrollWithMouse : 0) | (disable_menu ? 0 : ImGuiWindowFlags_MenuBar);
             ImGui::PushStyleVar(ImGuiStyleVar_ChildRounding, 5.0f);
-            ImGui::BeginChild("Child2", ImVec2(0, 260), true, window_flags);
+            ImGui::BeginChild("ChildR", ImVec2(0, 260), true, window_flags);
             if (!disable_menu && ImGui::BeginMenuBar())
             {
                 if (ImGui::BeginMenu("Menu"))
@@ -1841,7 +1841,7 @@ static void ShowDemoWindowLayout()
         {
             ImGui::SetCursorPosX(ImGui::GetCursorPosX() + 10);
             ImGui::PushStyleColor(ImGuiCol_ChildBg, IM_COL32(255, 0, 0, 100));
-            ImGui::BeginChild("blah", ImVec2(200, 100), true, ImGuiWindowFlags_None);
+            ImGui::BeginChild("Red", ImVec2(200, 100), true, ImGuiWindowFlags_None);
             for (int n = 0; n < 50; n++)
                 ImGui::Text("Some test %d", n);
             ImGui::EndChild();

imgui_internal.h

@@ -1006,8 +1006,8 @@ struct ImGuiContext
 
     // Windows state
     ImVector<ImGuiWindow*>  Windows;                            // Windows, sorted in display order, back to front
-    ImVector<ImGuiWindow*>  WindowsFocusOrder;                  // Windows, sorted in focus order, back to front
-    ImVector<ImGuiWindow*>  WindowsSortBuffer;
+    ImVector<ImGuiWindow*>  WindowsFocusOrder;                  // Windows, sorted in focus order, back to front. (FIXME: We could only store root windows here! Need to sort out the Docking equivalent which is RootWindowDockStop and is unfortunately a little more dynamic)
+    ImVector<ImGuiWindow*>  WindowsTempSortBuffer;              // Temporary buffer used in EndFrame() to reorder windows so parents are kept before their child
     ImVector<ImGuiWindow*>  CurrentWindowStack;
     ImGuiStorage            WindowsById;                        // Map window's ImGuiID to ImGuiWindow*
     int                     WindowsActiveCount;                 // Number of unique windows submitted by frame
@@ -1424,7 +1424,7 @@ struct IMGUI_API ImGuiWindowTempData
 // Storage for one window
 struct IMGUI_API ImGuiWindow
 {
-    char*                   Name;
+    char*                   Name;                               // Window name, owned by the window.
     ImGuiID                 ID;                                 // == ImHashStr(Name)
     ImGuiWindowFlags        Flags;                              // See enum ImGuiWindowFlags_
     ImVec2                  Pos;                                // Position (always rounded-up to nearest pixel)