<p>This doesn't sound like a Geany bug, but rather a problem with your Window Manager or perhaps GTK+. These menus that overflow are supposed to be scrollable using the arrow buttons at the top and bottom, see below:</p>
<p><a target="_blank" rel="noopener noreferrer" href="https://user-images.githubusercontent.com/181177/65397561-f0a08d80-dd65-11e9-9374-0b1515812909.png"><img src="https://user-images.githubusercontent.com/181177/65397561-f0a08d80-dd65-11e9-9374-0b1515812909.png" alt="geany_ft_dropdown" style="max-width:100%;"></a></p>

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