Nav: DragBehavior removed bogus test (#323)

Merge remote-tracking branch 'origin' into 2016-07-navigation

Using ImGuiID instead of ImU32 is a few places

Nav: quick tap on NavMenu with no focused window doesn't focus one (holding still does) (#323)

Nav: fixed using NavMenu/windowing select when no window is already focused + cleanup code (#323)

Nav: working on early bits of documentation (#323)

Nav: Not exposing ImGuiWindowFlags_NavFlattened because it requires much more work (#323)

Nav: Merge FocusedWindow and NavWindow that were basically duplicate at this point (#323)

Tidying up, removed two unnecessary window flags from being exposed in imgui.h

Nav: Added experiment ImGuiWindowFlags_NavFlattened flag to cross over between parent and non-scrolling child windows (#323)

Nav: No scrolling while using windowing functionalities (#323)

Nav: MoveRequest doesn't affect io.NavUsable so that navigation failure doesn't trigger false positive & not needed (undo part of 3cc1419df)

Merge remote-tracking branch 'origin' into 2016-07-navigation

SameLine() with explicit X position is relative to left of group/columns (ref #746, #125, #630)

Nav: making io.NavActive more suitable for end-user detecting if they should pass inputs to game (#323)

Nav: Calling SetItemDefaultFocus() doesn't make mouse cursor dirty if nav highlight is off (#323)

Nav: programmatic call to SetKeyboardFocusHere() doesn't quality as a nav input (doesn't position mouse) (#323)

Nav: Split _NoNav window flag into _NoNavInputs and _NoNavFocus (#323)

Nav: Fixed Collapse icon disappearing when Nav is disabled (since b2aaab8) (#323)

Tidying up

Nav: first committed pass for manual moving and manual scrolling (after a bunch of attempts) (#323)

Clarifying that MovedWindow* apply to mouse moving only

Nav: Fixed navigating outside of current scrolling bounds (bug from 0cc20fc) (#323) ...

+ spaces

ImRect: fixed Clip() function being the other way around (INTERNAL API BREAKING CHANGE- wasn't exposed, hoping nobody uses that) + actually fixes the function behavior.

Nav: ActiveIdAllowNavMove -> ActiveIdAllowNavDirFlags for more flexibility (nav up/down typically allowed on a single-line text input) (#323)

Nav: Renamed private ImGuiNavDir_ enum to use left/right/up/down to be consistent with key enums (#323)

Nav: CalcListClipping/ImGuiListClipper: fix to ensure we can navigate clipped lists (#323)

Nav: not activating widgets with NavActivate when NavMenu is held (#323)

Nav: collapse button is interactve, allow collapsing, tidying up, resize speed takes account of framebuffer scale (#323)

Shallow tidying up ctrl+wheel scaling code in NewFrame()