CollapsingHeader() with close button adapt to horizontal scrolling (#600)

Fix selectable/tree node not reaching right-side of contents size when horizontal scrolling is active and no explicit size is known

Fixed GetWindowContentRegionMax() being off by ScrollSize amount when SizeExplicit is set + caching ContentsRegionRect. ...

Relates to horizontal scrollbar, explicit contents size

Comments (#676, #655)

Demo: Tree: showing how to align tree node label with current x position (#324, #581)

Added optional Indent() Unindent() width (#324, #581)

Added TreeAdvanceToLabelPos() (#581)

TreeNodeEx(): ImGuiTreeNodeFlags_AlwaysOpen->ImGuiTreeNodeFlags_Leaf, + added ImGuiTreeNodeFlags_Bullet (#324, #581)

SetNextWindowSizeConstraint -> SetNextWindowSizeConstraints (#668)

BeginMenu: a menu that becomes disabled when open gets closed down, facilitate user's code (#126)

Comments (#335)

Fixed compile issue (bloody git stashes) (#668)

Added SetNextWindowSizeConstraint() + demo code (#668)

Minor sizing refactor, should be no-op. Making it a commit for further bisection since sizing code is super brittle. (#668)

Resizing window doesn't rely on MouseDelta anymore, but rather recompute expected size based absolute mouse coords. (#668) ...

Storing ActiveIdClickOffset to generalize pattern already used by
columns.

Minor bits

CheckStacksSize() added literal strings in IM_ASSERT calls to reach end-user on common failure

Including limits.h again to get INT_MAX, assuming previous report of missing limits.h was erroneous (#1, yes, issue ONE!)

Added NewLine() (very shy reminder that #97 isn't done)

Build fix

InputText(): Fixed cursor rendering on first character when framepadding is 0.0 (following #601)

ImGuiListClipper: removed assert (#662)

ImGuiListClipper new version, detect height automatically, fix compatibility with SetScrollPosHere (#662)

Metrics window: coarse clipping the detailed vertex buffer for pleasure and benefits.

ButtonBehavior(), fixed subtle old bug when a repeating button would also return true on release + comments (#656)

Fixed repeating button behavior triggering twice, typically affect the +/- of InputInt/InputFloat and user repeating buttons (#656) ...

+ Took note of further work
Broken in 547f34c

Fixed TitleBg/TitleBgActive color being rendered above WindowBg color, being inconsistent and causing visual artefact (#655) ...

Broke the meaning of TitleBg and TitleBgActive. Only affect values where
Alpha<1.0f. Fixed default theme.

Fixed incorrect parameter to ButtonBehavior() in Columns code - had no side-effect (#649) ...

Broken in 3eabad0

Comments / todos

Modal: fixed non-child window stacked over a modal losing its hoverabilty/focusability (#615, #604)