Fix re-shaping drag block issue
Initial drag allows dropping on gutter
Fix right-click bug
Empty lines as yellow blocks
Don't change z-indices
Shrink the drag canvas
Drag canvas start small
Merge branch 'master' of github.com:dabbler0/ice_editor_canvas

* 'master' of github.com:dabbler0/ice_editor_canvas:
  Drag canvas start small
  Shrink the drag canvas
  Don't change z-indices
  Empty lines as yellow blocks
  Fix right-click bug
  Initial drag allows dropping on gutter
  Fix re-shaping drag block issue
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