When using the pager "minimap" (via ctrl-alt-arrow) in a grid config (4 by 3 in this case), if you press two keys at once, the pager window closes and switches to the desktop you were last on instead of moving both directions rapidly (such as left then down or down then left).
Ah, I can reproduce this now. Had to just mash all four arrow keys.
Upstream as http://bugzilla.gnome.org/show_bug.cgi?id=103315