Misc: NavCalcPreferredRefPos selects between mouse and nav reference position + added sanity assert (merged from viewport branch to minimize branch drift).

Begin: Shuffled some code, _should_ have no side-effect. Clear NextWindowData in one call and more consistently. (merged from viewport branch to minimize branch drift).

Misc: Comments and shallow/small changes (merged from viewport branch to minimize branch drift).

ImGuiTextBuffer::appendfv needs to va_end the args_copy.

Internals: Removed unecessary Pos/PosFloat separation, only reason appears to be mostly pre-1.0. The only piece of code that I expected sub-pixel window position to matter actually already round its delta (wrongly so, will fix later/separately if we want).

Fix various typos.

Removed presumably obsolete MovingWindow tests which prevent move/merge logic in viewport branch from working in all situations (e.g. docking away when ActiveId is the ID of a tab)

Internals: Removed misleading ImRect::FixInverted + fix minor formatting in Readme. ...

Demo: Fixed Overlay: Added a context menu item to enable freely moving the window.

Window: Relaxed the internal stack size checker to allow Push/Begin/Pop/.../End patterns to be used with PushStyleColor, PushStyleVar, PushFont without causing a false positive assert. (#1767)

InputText: On Mac OS X, support Cmd+Shift+Z for Redo. Cmd+Y is also supported as major apps seems to default to support both. (#1765)

InputText: tweaks, minor refactoring, renaming + comments (#1695)

Columns: Fixed a bug introduced in 1.51 where columns would affect the contents size of their container, often creating feedback loops when ImGuiWindowFlags_AlwaysAutoResize was used. (#1760)

Window: Fixed windows using the ImGuiWindowFlags_NoSavedSettings flag from not using the same default position as other windows. (#1760)

InputText: Tweak to make the if statement more readable + update Changelog (#1747)

on OSX, ignore text input when CMD key is down

Documentations for Github users. Metrics: Fixed display of NavRectRel, added display of ParentWindow.

Fixed DisplaySafeAreaPadding not affecting popups/tooltips/menus at it should have (partly broken in 2e5577f).

BeginMainMenuBar: Followup to 1e41bad9. Removed public window flag. DisplaySafeAreaPadding defaults to (3,3) instead of (4.4). Comments, tab to spaces, Changelog. (#1439)

Added DisplaySafeAreaPadding to MainMenuBar height and fixed starting x position. Fixes main menu bar problems with TVs. (#1439)

Fixed default proportional item width lagging by one frame on resize + miscellaneous minor tweaks.

Fix typos KeyDown => KeysDown

Documentation bits. Misc comments.

Fix minor error in doc ...

Not a big deal.

Internals: Popup: Moved popup/menu/tooltip positioning code (viewport branch needs it organized in a different manner, so we are pushing the bulk of it here to minimize differences).

Internals: Window: Aggregating ImDrawList into the ImGuiWindow structure.

Settings: Fixed saving an empty .ini file if CreateContext/DestroyContext are called without a single call to NewFrame(). (#1741)

NewFrame: Prevent division by zero in frame rate calculation if io.DeltaTime is continuously zero. (#1740, #881)

Begin: moved tooltip position code in an else block. Misc comments

Internals: Renamed GetFrontMostModalRootWindow() to GetFrontMostPopupModal() and exposed in imgui_internal.h (#1738)

Misc: IM_DELETE() helper function added in 1.60 doesn't clear the input _pointer_ reference, more consistent with expectation and allows passing r-value.