Unredirected fullscreen DotA 2 (wine) windows hang when they lose focus

[Nell Hardcastle]

Running Steam in Wine and launching DotA 2, then sending/receiving a Steam message (which opens a background window) will hang the unredirected fullscreen window with no way to recover it. Disabling "unredirect fullscreen window" or changing the game to windowed mode works around the hang. I've reproduced this on 0.9.9~daily13.04.18.1, 0.9.9-daily13.06.14, and 0.9.10 from the compiz-experimental PPA.

Also tested on gnome-shell and it works fine there, making me think this isn't a Wine bug of some kind.