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.

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

Begin: Marked 5 parameters version of Begin() as obsolete. Now waiting for a riot to happen!

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)

Begin: Work toward obsoleting the 5-arguments Begin() overload. Removed size_on_first_use from internal BeginEx(). (2)

Begin: Work toward obsoleting the 5-arguments Begin() overload. (1)

BeginPopupContextItem() now supports a NULL string identifier and uses the last item ID if available. For interactive items (that have an ID) this works! For non interactive items we assert.

Fix IsItemHovered() issue on child by temporarily reverting 344d48b. This is not the ideal solution. (Fix #1370)

Removed apparently unncessary code in InputFloatN() and InputInt().

Exposed Scrollbar() in imgui_internal.h and removed a bool arg

Rnamed AlignFirstTextHeightToWidgets() to AlignTextToFramePadding(). Kept inline redirection function (will obsolete).

TreeNode: Added ImGuiTreeNodeFlags_FramePadding flag

Internal: ItemAdd(), IsClippedEx(): removed unnecessary indirection for ID parameter

Removed extraneous calls to GetCurrentWindowRead() when we already have a ImGuiContext. Internal RenderXXX functions also don't need to write into the Accessed field at all.

ColorButton: Reduced bordering artefact that would be particularly visible with opaque Col_FrameBg and FrameRounding enabled.

TextUnformatted(): minor tweak

Made AlignFirstTextHeightToWidgets() saner and faster (still disliking its name very much!)

SetKeyboardFocusHere() added assert to prevent passing values smaller than -1 as we may have to outlaw them (I think nobody was using that)

Removed obsolete comment.

Styles: Added ImGuiStyle::ScaleAllSizes(float) helper to make it easier to have application transition to e.g. High DPI with a matching style.

typo

Changed the internal name formatting of child windows to use slashes as separator, more readable.

Metrics: Draw window bounding boxes when hovering Pos/Size. List all draw layers, trimming empty commands like Render() does.

BeginMenu(): fixed logic to distinguish vertical menu from one layed out in a menu bar. Makes MenuItem() in a regular window behave more consistently, and this will be also needed by upcoming menu-navigation changes in the nav branch. (#126, #787)

BeginMenu: Shuffling braces around to clarify flow

Begin: Shallow tweak to minimize diff with nav branch

Merged from Navigation branch: ImGuiItemFlags_SelectableDontClosePopup flag

Added VerticalSeparator() entry point in imgui_internal. Seperator() in an horizontal layout context still does that.