TreeNode: added ImGuiTreeNodeFlags_AlwaysOpen flag (#581, #324)

TreeNode: added ImGuiTreeNodeFlags_OpenOnArrow flag (#581, #324, #190)

Demo: Added simple tree node selection demo (#581, #516, #190)

Added ImGuiTreeNodeFlags_OpenOnDoubleClick (#581, #516, #190)

Added TreeNodeEx() functions (#581, #600, #190)

Added IsItemClicked() helper (#581)

TreeNodeEx() wired the display-side ImGuiTreeNodeFlags_Selected flag (#581)

Fixed ImGuiTreeNodeFlags_AllowOverlapMode to behave better on touch-style inputs (#600)

Added CollapsingHeader() variant with close button, obsoleted 4 parameters version. Refactored code into TreeNodeBehavior. (#600) ...

New flag and declaration makes uses of SetNextTreeNode() functions on
collapsing header more obvious as well (#579).

Added IsRootWindowOrAnyChildHovered() helper (#615)

Updated FAQ about non UTF-8 literal (#609, #613)

Made ImGui::PushClipRect()/PopClipRect() public. Changed ImDrawList::PushClipRect() prototype. Fixed demo. (#610)

ImFont: Added AddRemapChar() helper (#609)

BeginGroup() comment tweaks (#608)

BeginGroup() extra comment because this is overused and misleading (#608)

ImFont: IndexLookup stores short instead of int, so typical ascii-set lookup fits in 256 bytes

ImFont: Tweaking layout, shaving bit of alignment and simple hot/cot split

ImFont: RenderText() useful directly without ImDrawList::AddText().. Changed prototype. Reserving vertices after skipping non-visible lead.

ImFont: Added RenderChar() helper.

ImDrawList: Added AddQuad(), AddQuadFilled() helpers.

Todo items + not using function called isblank() because it may be a macro in some C library

Version 1.49 WIP

Version 1.48

Warning fixes for clang. Using int64_t, may be an issue?

Style: removed WindowFillAlphaDefault which was confusing and redundant, baked into WindowBg color. Renamed TooltipBg > PopupBG. (#337) ...

bg_alpha parameter of 5-parameters version of Begin() is an override,
however that function may become obsolete someday.

Added ImGuiWindowFlags_AlwaysUseWindowPadding flag to ensure non-border child window uses window padding (#462)

Renamed ImGuiWindowFlags_Force**Scrollbar to ImGuiWindowFlags_Always**Scrollbar (#476)

Updated todo list and comments

Moved EndFrame() back to imgui_internal.h + comments. Undo cfbf06e

IO: Added unused MultiSelectUsesSuperKey dummy field to convey semantic for OS X compatible behavior (#473)