Created attachment 524198 [details]
screenshot showing the window fragment right before the newly opened terminal will appear
Description of problem: In GNOME Shell, if I have a large application A1 window open on workspace 1 and start another app on workspace 2, for a brief moment, the bottom of app A1's window appears near the top of workspace 2.
Version-Release number of selected component (if applicable):
$ rpm -q mutter gnome-shell
Steps to Reproduce:
1. on empty workspace 1, open Firefox or Claws Mail - resize the window to maximum vertical height (although less than that works, too, but not with less than 50% height)
2. switch to empty workspace 2
3. open Activities screen
4. click gnome-terminal Favorites launcher
For fractions of a second, at the top of the display the bottom of the Firefox or Claws Mail window appears, then vanishes again when the gnome-terminal appears. I've managed to make a Screenshot just before gnome-terminal appeared. [At the very left near the mouse pointer one can still see the Favorites menu having faded out almost completely. The gnome-terminal icon border can be recognized.]
No graphical artefacts when opening the terminal on the empty workspace 2.
Additional info: ATI Raedon HD 3450 / RV620
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