Menus: Fixed an issue with child-menu auto-sizing (issue introduced by 6af92b0) (#3779)

docs/CHANGELOG.txt

@@ -50,12 +50,13 @@ Other Changes:
   close button in the window. (#3731)
 - SliderInt: Fixed click/drag when v_min==v_max from setting the value to zero. (#3774) [@erwincoumans]
   Would also repro with DragFloat() when using ImGuiSliderFlags_Logarithmic with v_min==v_max.
-- imgui_freetype: Facilitated using FreeType integration: [@Xipiryon, @ocornut]
+- Menus: Fixed an issue with child-menu auto sizing (issue introduced in 1.80 on 2021/01/25) (#3779)
+- Fonts: imgui_freetype: Facilitated using FreeType integration: [@Xipiryon, @ocornut]
   - Use '#define IMGUI_ENABLE_FREETYPE' in imconfig.h should make it work with no other modifications
     other than compiling misc/freetype/imgui_freetype.cpp and linking with FreeType.
   - Use '#define IMGUI_ENABLE_STB_TRUETYPE' if you somehow need the stb_truetype rasterizer to be
     compiled in along with the FreeType one, otherwise it is enabled by default.
-- imgui_freetype: Added support for colored glyphs as supported by Freetype 2.10+ (for .ttf using CPAL/COLR 
+- Fonts: imgui_freetype: Added support for colored glyphs as supported by Freetype 2.10+ (for .ttf using CPAL/COLR 
   tables only). Enable the ImGuiFreeTypeBuilderFlags_LoadColor on a given font. Atlas always output directly
   as RGBA8 in this situation. Likely to make sense with IMGUI_USE_WCHAR32. (#3369) [@pshurgal]
 - Fonts: Fixed CalcTextSize() width rounding so it behaves more like a ceil. This is in order for text wrapping

imgui.cpp

@@ -6576,6 +6576,7 @@ void ImGui::SetWindowPos(ImGuiWindow* window, const ImVec2& pos, ImGuiCond cond)
     ImVec2 offset = window->Pos - old_pos;
     window->DC.CursorPos += offset;         // As we happen to move the window while it is being appended to (which is a bad idea - will smear) let's at least offset the cursor
     window->DC.CursorMaxPos += offset;      // And more importantly we need to offset CursorMaxPos/CursorStartPos this so ContentSize calculation doesn't get affected.
+    window->DC.IdealMaxPos += offset;
     window->DC.CursorStartPos += offset;
 }
 

imgui.h

@@ -59,7 +59,7 @@ 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               "1.81 WIP"
-#define IMGUI_VERSION_NUM           18002
+#define IMGUI_VERSION_NUM           18003
 #define IMGUI_CHECKVERSION()        ImGui::DebugCheckVersionAndDataLayout(IMGUI_VERSION, sizeof(ImGuiIO), sizeof(ImGuiStyle), sizeof(ImVec2), sizeof(ImVec4), sizeof(ImDrawVert), sizeof(ImDrawIdx))
 #define IMGUI_HAS_TABLE
 

imgui_widgets.cpp

@@ -6758,7 +6758,7 @@ bool ImGui::BeginMenu(const char* label, bool enabled)
 
     if (menu_is_open)
     {
-        SetNextWindowPos(popup_pos, ImGuiCond_Always);
+        SetNextWindowPos(popup_pos, ImGuiCond_Always); // Note: this is super misleading! The value will serve as reference for FindBestWindowPosForPopup(), not actual pos.
         menu_is_open = BeginPopupEx(id, flags); // menu_is_open can be 'false' when the popup is completely clipped (e.g. zero size display)
     }
     else