[PyQt] Crash on exit using QCompleter for QComboBox

[Jeremy Sanders]

I wonder whether the following is a bug in my code or in PyQt. If you 
try to use the completer for completing text, then exit, there is a 
segfault in QWidgetPrivate::deleteTLSysExtra().

This goes away if the completer is removed and deleted before the 
program exits (uncomment final two lines in main).

I assume this is some sort of ownership issue, but I've tried various 
combinations of parents and so on, to no avail. I've worked around this 
in my code by creating and removing the completer in showEvent() and 
hideEvent(), but this is rather ugly.

This is PyQt4-4.10.2 and sip-4.14.7 on Linux.

Thanks

Jeremy

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