Comment 11 for bug 367136

xtrs (http://tim-mann.org/xtrs.html) is being victimized by this bug too. xtrs does not want X key repeat, so when the mouse enters the xtrs window, xtrs remembers the current state of key repeat and turns it off. It then restores the previous key repeat state when the mouse leaves the window or you exit from xtrs. I've gotten various keys to repeat infinitely when typing and moving the mouse in and out of the xtrs window.

I notice in the Ubuntu discussion that x11vnc and VMware Workstation are also affected, probably for the same reason -- they don't want X key repeat and thus turn it off automatically at certain times.