Nav: InputTextMultiline: Fixed navigation/selection. Disabled selecting all when activating a multi-line text editor. (#787)

Nav: InputText: Fixed using Up/Down history callback feature when Nav is enabled (#787)

Nav: Internals: Moved some internal code to namespace, comments

Nav: NavProcessItem() updates current NavLayer. Basically we're hearing toward rebuilidng nav info from an id. (#787).

Nav: NavProcessItem() computes window-relative rectangle using own Window rather than NavWindow. Not sure what it may mean for child-flattened-nav (disabled). (#787)

Nav: SetFocusID() update NavWindow and NavRectRel just as we get them. Needed by upcoming commit, committing separately as I'm curious if it has any side-effect. (#787)

Merge branch 'master' into navigation

ImDrawList: Fixed a bug in ChannelsMerge() leading to an extraneous draw call being created, which unexpectly led to more dramatic condition but to faulty draw command merging code. (#1172, #1368)

Merge pull request #1368 from ripieces/rendering-issue-1172 ...

ImDrawList: Merging issue fix.

Rendering issue fix ...

Fixes ocornut/imgui#1172

Nav: Renaming a field + Comments.

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

Update README.md

Update README.md

Update README.md

Nav: ButtonBehavior() keep _displaying_ NavId item as howered when refocusing or moving window, which is consistent with IsItemHovered() and reduce noise/flicker (#787)

Reluctantly exposed GetActiveID(), GetHoveredID() in imgui_internal because the demo code will need it.

Nav: Shallow tweaks.

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

Nav: Internals: Renamed ImGuiButtonFlags_NoNavOverride to ImGuiButtonFlags_NoNavFocus + fixed a theorically missing test in ButtonBehavior() (#787)

Nav: Internals: Renamed SetActiveIDNoNav -> SetActiveID() and old SetActiveID() -> SetFocusID(), both functions needs to be called when both are desirabled. (#787) ...

May break code relying on imgui_internal.h, relying on nav and not calling ButtonBehavior().

Internals: Moved SetNavID() and renamed casing to be consistent with stuff exposed in imgui_internal.h

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

Internals: SetActiveID window cannot be NULL

Nav: commiting shallow bits to reduce noise from working copy/upcoming commit.

Nav: Extract part of NavUpdate() into a saner NavUpdateWindowingTarget() (#787)

Nav: Made NavWindow always refresh from NavId so we can lazily retrieve the window for user functions that don't have it. This is not required by current commit but I'd rather test it earlier. Idea: eventually if we switch to 64-bit identifiers we could reserve e.g. 20 bits to store a simplified window identifier so we can always retrieve a window from an id. (#787)

Nav: SetActiveId() uses SetActiveIDNoNav() to avoid duplicating logic. (#787)

Nav: Extract part of NavUpdate() into a saner NavScrollToBringItemIntoView() (#787)

Nav: More consistently drawing a (thin) navigation rectangle hover filled frames such as tree nodes, collapsing header, menus. (#787)