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

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).

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

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

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)

Internals: Window: Aggregating ImDrawList into the ImGuiWindow structure.

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

Version 1.61 WIP

Version 1.60

Internals: Removed unused internal variant of ArrowButton().

Fixed a few zealous warnings.

NewFrame: Extract some code into a NewFrameUpdateHoveredWindowAndCaptureFlags() which can be of use with touch-based inputs systems.

NewFrame: Extract some code into a NewFrameUpdateMouseInputs function. Moved settings saving higher up in the function so it is next to its peers.

Fixed Clang zealous cast-call warning (on par with GCC) which decided to warn against explicit C-style casts now.

Internals: Removed ImGuiDataType_Float2.

Added InputDouble() function. We use a format string instead of a decimal_precision parameter to also for "%e" and variants. (#1011) May transition the other InputXXX function to use format strings as well.

IO: Renamed io.WantMoveMouse to io.WantSetMousePos (was added in 1.52, _not_ used by core and only honored by some binding ahead of merging the Nav branch) + internal renaming (#787)

Nav: Track nav input source more generally (gamepad vs keyboard) (#787) + update todos and demo tweaks

Moved IM_NEW, IM_DELETE helpers to imgui.h for convenient use by back-ends and user code.

Internals: Columns renaming fields

Drag and Drop: Increased payload data type to 32 characters. (#143)

Columns: Extent stop at the right-most clipped pixel. The right-most column might appear a little wider but it's usable space matches the others. (#125). +9 Internal: Store InnerClipRect.

Renamed ImGuiStyleVar_Count_ to ImGuiStyleVar_COUNT for consistency with other enums. Added

Added ArrowButton(). Exposed ImGuiDir.

Internal: renamed RenderTriangle() to RenderArrow().

Internal: Moved IM_NEWLINE helper to imgui_internal.h

Renamed ImGuiNavFlags io.NavFlags to ImGuiConfigFlags io.ConfigFlags. (#787)

ImRect: Removed misleading IsFinite() function used by some Nav code.

TreeNode: Renamed Beta ImGuiTreeNodeFlags_NavCloseFromChild to ImGuiTreeNodeFlags_NavLeftJumpsBackHere. (#1079)

Nav: Internals: Exposed NavMoveRequestCancel in imgui_internal.h (#1640)