am 254a6b42: am 82220026: Merge "Fade in/out the undo bar." into jb-dev

* commit '254a6b42372179bcc9cf6166639325d11411be77':
  Fade in/out the undo bar.
tree: cea401a50b9988d155259f0b11ad04d5d31ce7d5
  1. gallerycommon/
  2. src/
  3. src_pd/
  4. tests/