[PyKDE] canvas related segfault

[Phil Thompson]

> Hi Phil,
>
> there was a nice little qt tile based imaging example published today
> in the german linux magazine, and I thought, it would be nice to play
> with in PyQt, thus I converted it. Now it appears, that after loading
> an image and quitting, it segfaults reproducible, unless I use the
> WDestructiveClose flag on the main window. Here's a typical backtrace:

I haven't looked at this in detail, but the comments at the bottom of
canvas.py in the PyQt examples might be relevant here.

Phil