Demo: Added display for IsMouseDragging() function.

Demo: Display better mouse cursor info for debugging backends.

Demo: Console: Fixed incorrect positioning which was hidden by a minor scroll issue (this would affect people who copied the console code as is)

Demo: Layout: Removed unnecessary BeginChild/EndChild calls

ImGuiTextBuffer: Renamed append() helper to appendf(), appendv() to appendfv(). Added reserve().

Exposed ImDrawCornerFlags, replaced occurences of ~0 with an explicit ImDrawCornerFlags_All. Inversed BotLeft (prev 1<<3, now 1<<2) and BotRight (prev 1<<2, now 1<<3).

Demo: Tweaked Image() code.

Style Editor: Simplified settings also show PopupBorderSize as a checkbox. (#707, #1019)

Style, Begin: removed ImGuiWindowFlags_ShowBorders window flag. Borders are now fully set up in the ImGuiStyle structure (see e.g. style.FrameBorderSize, style.WindowBorderSize). Use ImGui::ShowStyleEditor() to look them up. (#707, fix #819, #1031, ref #1019, ref #447)

Demo: Fix warning "format not a string literal and no format arguments" for over-zealous compilers settings. (#1450, #1451)

Style: Added PopupRounding setting. (#1112)

Style: Added a default StyleColorsLight(). (#707)

Demo: Tweaks.

Style Editor: Using local storage so Save/Revert button made some more sense without code passing its storage. Tweaked layout, added horizontal scroll bar, Fixed Save/Revert button to be always accessible. (fix #1211)

Style Editor: Sneakily adding a combo box to change colors (#707)

Style: renamed style.ChildWindowRounding to style.ChildRounding, ImGuiStyleVar_ChildWindowRounding to ImGuiStyleVar_ChildRounding.

Made it guaranteed by API that after calling Begin() the last Item represent the title bar. (#823)

Columns: Clipping columns borders on Y axis on CPU because some GPU drivers appears to be unhappy with triangle spanning large regions (not sure why tbh). (#125) ...

Demo: Columns: Adding a billion of extra lines and using clipper.

Demo: Custom Rendering: Fixed clipping rectangle extruding out of parent window.

Examples: Constrained Resize: Added more test cases (for #1417)

IsWindowHovered(): Added ImGuiHoveredFlags_FlattenChilds flag. Made IsRootWindowOrAnyChildHovered() obsolete in favor of IsWindowHovered( ImGuiHoveredFlags_FlattenChilds) (#1382, #1404)

Demo: Comments (#1408)

Minor tweaks to the user guide.

Version 1.53 WIP

Version 1.52

ImFormatString, ImFormatStringV(): clarifying specs so that passing a NULL buffer should return the desired length. (#1038)

Demo: Fixed Fonts "set as default button" not having collading id on collapsed nodes.

Popups: Fixed right-click to close popups not handling modal windows properly. (~#439)

IsWindowHovered(): Changed default behavior to now return false is a widget from another window is active + Added support for ImGuiHoveredFlags_AllowWhenBlockedByActiveItem. (relate to drag'n drop idoms: #143)

IsItemHovered(), IsWindowHovered(): added flags to enable various and more specific behavior. Will enable improvements for popups/context menus and drag'n drop. (relate ~#439, #1013, #143, #925) ...

The legacy confusing IsItemRectHovered(), IsWindowRectHovered() can be completely removed now.
Changed IsWindowHovered() behavior with default parameter: it now return false is the window is blocked by a popup.
Demo: Added tests for those two functions.