I incremented a counter in the button-down event handler and printfed 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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