IDEA-114933 Search everywhere triggers if shift is pressed only once

Fix Linux key autorepeat behavior.

This changes not fully fix the original problem but resolve triggering 
of SearchEverywhere action by pressing Shift only one time (not releasing). 

On my environment on most of cases I able to call SearchEverywhere action 
by pressing Shift two times, but in some case it's fail unfortunately. It 
seems it's related to logic which begins under 144 line of original 
SearchEverywhereAction.java.

In any case it will be great if such code will helps...

Best Regards,
Vladimir