eating each others events.
Manifests itself in GPU thread waiting forever for a reply in GL library code(and thus
a frozen emulation). Most of the time, this can be resolved by creating more events
(clicking, changing focus), but sometimes it stays stuck.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6218 8ced0084-cf51-0410-be5f-012b33b47a6e