GNOME Bugzilla – Bug 734919
If an application freezes, clicking on the client-side decorations (CSD)' close button on a headerbar doesn't tell the window manager
Last modified: 2014-08-16 21:48:52 UTC
If you have a frozen app, traditionally you would click the X button of its window and after a few secs, Mutter would say "hey this app is frozen, want to force-quit?" This doesn't work anymore with applications that have their close button in a headerbar...
we're already tracking this with bug 729786, as part of a general CSD compatibility issue. *** This bug has been marked as a duplicate of bug 729786 ***