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Show me the screenshot. I'm staring at inkscape on XP and it's using GTK+'s native file dialog. Redrawing is an issue as well, no matter how much you wish it wasn't.
I tested GTK+ and wxWidgets to see what to use to program a little utility app I wrote. I ended up choosing wx because of the above issues, which was disappointing.
Here's to the continual improvement of cross platform GTK+!