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Fix 797755 Allow X*IfEvent() to reenter libX11

Matthieu Herrb requested to merge mherrb/libx11:fix-xifevent-fix2 into master
  • the activation logic is reverted
  • there is also _XInternalLockDisplay() that needs protection
  • I've found cases (in fvwm2) where the callback calls XCheckIfEvent() recursively. So the flag needs to be a counter.

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