Toolbar issues in fullscreen mode on OS X
There are painting glitches on toolbar when using fullscreen mode on OS X 10.11.3 (El Capitan).
Details in the video: https://www.youtube.com/watch?v=lJL5GgRc7Xs&feature=youtu.be
The issue might be connected to clip/project preview renderers, disabling these widgets in MainWindow code fixes all glitches.