NewFrame() now asserts if neither Render or EndFrame have been called. Exposed EndFrame(). Made it legal to call EndFrame() more than one. (#1423 etc.)

Internals: Renamed ImGuiWindow::Accessed to WriteAccessed.

Internals: Window minor internal renaming + added WindowRounding latch.

Columns: Added ImGuiColumnsFlags_GrowParentContentsSize to internal API to restore old content sizes behavior. (#1444, #125)

Internals: Window: Store whether the windows has a close button (we need that info for window/tabs dropping preview calculation)

Internals: Added BringWindowToFront(), BringWindowToBack() helpers.

Internals: Added ArrowButton() helper.

Internals: Remove requirement to define IMGUI_DEFINE_PLACEMENT_NEW (#1103)

Internal: FindWindowByName() faster and doesn't touch every windows

Maintaining ActiveIdTimer and HoveredIdTimer (the later is useful for drag and drop, both will be of course for creators of custom widgets)

Version 1.53 WIP

Version 1.52

Comments

Internal: Added ImVec4 operators

Internal: BeginTooltipEx() in imgui_internal.h

Merged a bit of code from Navigation branch to ease further merging (InnerRect is currently not required in the Master branch)

Minor renaming.

Exposed IM_ARRAYSIZE() in imgui.h

Added most basic form of Disabled flag to disable interactions (but visuals aren't altered), in imgui_internals.h, undocumented/unsupported (#211, #1012)

Internals: ImLerp() helper for ImVec4

Moved IMGUI_DISABLE_OBSOLETE_FUNCTIONS block lower in the imgui.h file so obsolete functions can use flags. Also sane to quarantine them outside of the respectable area.

Internals: PaintVerts** renamed to ShadeVerts**, moved to imgui_draw.cpp and exposed in imgui_internal.h (+1 squashed commits)

Internals: Added ImLinearSweep() helper.

Internals: RenderCollapseTriangle() -> RenderTriangle(), takes a ImGuiDir

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)

Internals: ButtonBehavior: made ImGuiButtonFlags_PressedOnClick and ImGuiButtonFlags_PressedOnDoubleClick set the click offset correctly + hold on g.ActiveId so Held state can be reported. Added ImGuiButtonFlags_NoHoldingActiveId flag to disable the later.

Internals:Helpers: Added ImSwap(int,int), exposed ImStrncpy().

Checkbox: Using checkmark. MenuItem: Tweaked checkmark, thicker.

Begin: Work toward obsoleting the 5-arguments Begin() overload. Internal BeginEx() becomes the normal public Begin() again! (4)

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