[PyQt] widget show/hide bug

[Vsevolod Fedorov]

Hello!

I have stumbled on problem that can be demonstrated by the following 
snippet:
----
from PyQt4 import QtGui
import sys

app = QtGui.QApplication(sys.argv)
w = QtGui.QWidget()
w.show()
w.hide()
w.show()
app.exec_()
----
After its execution widget stays hidden and application keeps running 
(without any visible windows).
Actual code that suffers from it is naturally much more complicated, but 
workarounds are harsh and do not always work.

Qt version 4.3.4, pyqt version 4.3.3.

Seva