Nav: Fix typo from 9712a81

Nav: Minor tidying up (adding local variables to be a little more sane).

Nav: Renamed internal field.

Nav: Rectangle rectangle stored per window and per layer as well. Makes things simpler, allows enable us to visualize more data.

Nav: Marked misleading/broken code that will never execute.

Nav: Fixed menuitems/selectable on menu layer (layer 1) from storing themselves in wrong layer of LastNavIds when hovered.causing inconsistencies and bugs when hovering menu with mouse then pressing ALT to return to layer 0). ...

NB: this is not a new bug introduced by the previous commit (which is related to nav layers), bug has been there for a while. (#787)

Nav: Store per-window last nav id also per-layer so we can easily query them for menu navigation code. (#787)

Merge branch 'master' into navigation ...

# Conflicts:
#	imgui.cpp
#	imgui_internal.h

BeginMenu: Shuffling braces around to clarify flow

Nav: Fixed SetItemDefaultFocus from stealing default focus when we are initializing default focus for a menu bar layer (#787)

Nav: Support for fallback horizontal scrolling with PadLeft/PadRight (nb: fallback scrolling is only used to navigate windows that have no interactive items). (#787)

Nav: Commiting some better organized Debug helper because this going to stay for a bit.

Demo: Added an extra test related to baseline and fixed an id collision.

Comments

Removed extraneous test.

Update README.md

ColorPicker4: Use nav flag to provide a slighly better experience when using navigation (#787, #346)

Demo: Added an extra test related to baseline and fixed an id collision.

Nav: Added ImGuiItemFlags_NoNav item flag

Nav: Re-arranged ItemAdd() to maximize early out (#787)

ButtonBehavior: Tidying up.

Nav: Internal nenaming

Comments

Nav: Changed internal flag to NoNavDefaultFocus to be false by allow, and more consistent (#787)

Nav: Fixed ButtonBehavior mistakenly setting active id when the Activate button is held and we have a new NavId, which affected browsing some popups (#787)

Merge branch 'master' into navigation ...

# Conflicts:
#	imgui.cpp
#	imgui_internal.h

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.

Separator(): Tweak Logging so that the separator text is aligned according to tree padding.