Bug 135056 – Alt-Tab doesn’t work during drag-and-drop (nor does workspace switch, etc.)
See http://bugzilla.gnome.org/show_bug.cgi?id=390312 for gtk side of this problem. GTK grabs keyboard at the moment but that can be fixed. QT applications do not grab keyboard on DND right now if you need to test it without newest patched GTK.
I just find it the ultimate annoyance after being used to it for so long. So for those would be Linux users be wary of Gnome and other GTK based applications
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The Wheat Field 