There's a bug with the Geanygdb plugin where if the the debug side window is too small for its contents, its widgets overflow outside their area. For example the gdb console command input text widget floats above the message window.
The attached patch fixes the problem by making the debug side window scroll if it doesn't fit in its alloted space. Hopefully I'm not doing anything silly, this is the first time I've used Gtk.
Regards,
Cameron.