Merge changes Id95e80ff,Ica28e470,I63d524ae,I5c765b4e,Id93cfc7d, ... into sc-dev

* changes:
  Long screenshots: allow adjusting the max capture size
  Long screenshots: Fix/simplify ImageTileSet.toBitmap
  Long screenshots: limit batch capture to 3 pages
  Long screenshots: allow capture in reverse direction
  Long screenshots: dispatch listeners on UI thread
  Long screenshots: Fix clipRect for ImageTile