Without this something like the following can happen: 1) client connects 2) client sends alt press key event 3) client disconnects without any cleanup (kill -9 it to reproduce) 4) Another client connects 5) guest still think alt is pressed 6) All key presses register as alt-foo
commit 2d28da3c17f115fb1be4e5045e4a7a67fd1158b9 Author: Marc-André Lureau <marcandre.lureau@gmail.com> Date: Fri Oct 4 18:48:41 2013 +0200 server: release all pressed keys on client disconnect
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