Bug#719496: freeorion: input textfields doesn't work after a while.

[Marius Wegner]

using alt-tab to switch out and back to freeorion forces a similar bug  
where backspace keeps working. in default case of real bug, backspace  
doesn't work either. clicking alt solves this bug, but not the real bug,  
which occurs a few minutes or seconds later and is not solvable with  
clicking alt.

i reinstalled freeorion and freeorion-data. while xtrace freeorion i do
* wait a few minutes and don't switch windows.
* click on singleplayer to get a input textfield and try typing, which  
doesn't work.
* quiting freeorion.
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