I was playing around with gtk2hs and STM when I experienced some (at
least to me) surprising behavior. I have no idea what's going on so I
may very well be the culprit.
To reproduce, uncomment either 'onFocus' or 'afterFocus' in the
attached file. Using 'onFocus' results in a segfault and using
'afterFocus' results in an assertional failure in gtk.
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