<p>No this is most definitely not an XFCE problem. There is simply 1px wide border around the edit area (including scrollbar) which prevents the scrolling on the very right edge.</p>
<ol>
<li>maximize geany -or- put it in fullscreen mode with F11</li>
<li>push the mouse to the absolute right edge of the screen</li>
<li>try to click to grab the scrollbar - you can't</li>
</ol>

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