- moved the QApplication::processEvents calling sequence
from TGQt::EventPending to TGQt::NextEvent method.

It should "reduce" the probability of the "dead lock" for the Qt-based
multi-threaded ROOT applications. The problem was popped up under recent
ROOT just by chance. It might have been seen under either ROOT versions.

The TGQt::EventsPending() method was written to facilitate the Win32
multi-thread Win32 GUI layer. Since Qt-version on all platforms uses the
single threaded GUI the method in question can be reshaped. I have done
that.


git-svn-id: http://root.cern.ch/svn/root/trunk@15590 27541ba8-7e3a-0410-8455-c3a389f83636