I incremented a counter in the button-down event handler and `printf`ed it in the button-up handler and it appears some of the up events are getting lost ...
but only when the Geany window is full screen (you know, the + on the top bar on sensible DEs :)
Unless @b4n tells me we deliberately stop some button-up events from propagating then I will say this is a GTK problem, and I can live with the workaround of not making Geany full screen.
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