This appears to be a duplicate of #970758
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https://bugs.launchpad.net/bugs/985902
Title:
The menu doesn't disappear normally after a right click on an item
To manage notifications
*** This bug is a duplicate of bug 970758 ***
https://bugs.launchpad.net/bugs/970758
marked as duplicate
** This bug has been marked a duplicate of bug 970758
Menu is frozen after opening it and it will not disappear (even after
clicking on the desktop) unless clicking on it again
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