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

Bullet(), BulletText(): slightly bigger. less polygons

ButtonBehavior(): ImGuiButtonFlags_PressedOnDoubleClick clears active id on double-click so that multiple flags don't trigger multiple times

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

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

Refactor ButtonBehavior(), fixed double-click mode also triggering on single-click (relate to #516)

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)

Comments/tweaks on ItemAdd()

PushClipRect(): not altering passed values, leave it to caller responsibility to floor properly (followup #582)

Metrics window: uses IM_COL32() macro to generate constant colors.

MenuItem(): checkmark render in disabled color when disabled

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

Fixed GetFrontMostModalRootWindow() (#604)

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)

Scrollbar: minor fix for top-right rounding of scrollbar background when window has menubar but no title bar

MenuBar fixed missing lower border

Moved Bullet*() code below TreeNode*() code.

Fixed typos in previous commit 1884f55 (#582, #597))

Fixed clipping rectangle floating point representation to ensure renderer-side ops yield correct results (#582, 597)

Internal ImRound() -> ImFloor(), ImRect::Round() -> ImRect::Floor(),

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

InputText() clipping cursor rendering in case it gets out of the box (which can be forced w/ ImGuiInputTextFlags_NoHorizontalScroll) (#601)

Refactored CloseWindowButton() into a CloseButton() helper declared in imgui_internal.h (#600)