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"In my experience wx apps look fairly broken in either environment."
It sounds like most of your experience is with rather dated builds. I use both Debian unstable and suse, and haven't seen a gtk1 wx application in quite some time on either. I used to find the gtk2 build buggy, but again, that was ages ago. Though I suppose it's certainly possible that the bugs are there, but I'm not happening to use any of them. And Wx certainly does have sizers now.