[xmonad] Issue 557 in xmonad: xmonad grabs keyboard and mouse on focus follows mouse, reproducibly

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Comment #9 on issue 557 by joeyhe... at gmail.com: xmonad grabs keyboard and  
mouse on focus follows mouse, reproducibly
http://code.google.com/p/xmonad/issues/detail?id=557

I reported this bug when I'd just switched to a new laptop. I noticed that  
over time, the frequency of the bug happening went down. I apparently was  
doing something when the hardware was new to me, that I stopped doing.  
Probably fat-fingering its clickpad in some way was causing it to occur  
early on. Also, using the touch screen it's easy to reproduce the bug, but  
you need a touch screen (and now I keep mine turned off!)

Today, I found another, perhaps better way to reproduce a similar problem.  
All I need is a single window open in the current workspace. I first press  
and hold the left Windows key (mod). Then I press and release the right Alt  
key (this should be identical to clicking mouse button 2, which my laptop  
does not allow doing in hardware.. I use xkbset to bind right Alt to mouse  
button 2). Then I release the left Windows key.

Unlike the problem initially described, this results in the mouse movement  
not getting grabbed. Otherwise the behavior is as described: No key presses  
or mouse clicks (or focus follows mouse) has any effect, until I restart  
xmonad.

For some reason, I can't reproduce that with the stock xmonad  
configuration. However,
I can reproduce it with the default mouseBindings setting. If I install a  
custom mouseBindings that leaves off the mod-button2 binding, that  
naturally avoids the problem. (However, clicking on the touch screen can  
still cause the problem in that configuration.)

BTW, I seem to see some flashing of the window border when this bug  
happens, as if the window lost and regained focus.

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