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.

Demos: Tweaks of popups/context/menus section.

CollapsingHeader(bool*) variant: fixed for IsItemHovered() to work properly in the nav branch.Basically the close button now has to use ItemAdd() to be navable into, which overwrite the IsItemHovered data. (#600, #787)

Begin: Work toward obsoleting the 5-arguments Begin() overload. Removed bg_alpha from internal BeginEx(). (3)

BeginPopupContextItem() now supports a NULL string identifier and uses the last item ID if available. For interactive items (that have an ID) this works! For non interactive items we assert.

Rnamed AlignFirstTextHeightToWidgets() to AlignTextToFramePadding(). Kept inline redirection function (will obsolete).

TreeNode: Added ImGuiTreeNodeFlags_FramePadding flag

Demo: Added an extra test related to baseline and fixed an id collision.