Merge changes I80100f39,I4b39c1c4,I65ce9a23,I5094a137,Id898752f, ...

* changes:
  Make sure SysUI is not constantly redrawing status bar
  Fix app staying in drag resizing when undocking
  Fix flicker when dismissing non-docked stack
  Start drawing immediately
  Improve dismiss/scrolling handling in recents
  Dim harder when dismissing