<p></p>
<p>The window titles (excluding Wayland and some window managers) are handled by the window manager itself, which is a separate process outside Geany, so the Geany hang of the rendering loop won't affect it, but everything inside Geany is just queued waiting for the render loop to get going again when its finished waiting for the files to load, or some other signal.</p>
<p>Probably a signal is getting lost, and small files make it less likely to be missed. [Theory x, not sure what x is up to].</p>
<p>Your feature request should be on its own issue, it will be lost here, but just to note, its unlikely, undo undoes changes to the buffer, but when the file is closed the buffer is deleted, so there is nothing to record the closing against to undo it.  Also it would be ambigupous if the undo related to the closed file or the new current buffer.  Just re-open it from the recent files list.</p>

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