Settings: Internal renaming of structure and fields names.

Menu bar: better software clipping to handle small windows, in particular child window don't have the minimum constraint added in e9a7e73 so we need to render clipped menus better.

Internals: Added SplitterBehavior(). (#319)

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).

Add ShadeVertsLinearUV()

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)