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I'm trying to use window-configuration-change-hook in a package to perform some action when a buffer becomes visible for the first time. It works, however when starting Emacs, desktop-mode calls switch-to-buffer as it is restoring buffers, which triggers window-configuration-change-hook. I don't want that to count because the user doesn't actually see the the buffers as they are restored.

Is there a good way to avoid false positives from desktop-mode? Or maybe a better way to detect when a buffer becomes visible?

My only current idea is to add a timer or something to ignore cases where the buffer is only "visible" for a very short period, but I don't really like that idea.

  • Just a quick-and-dirty thought, without thinking it through: Desktop mode can save variables. You could have it save window-configuration-change-hook and restore it. You might have to find out whether vars are restored before or after the buffer switches and adjust accordingly. – Drew Jun 22 at 14:53
  • I suggest you file a bug report against desktop.el. – Stefan Jun 22 at 15:20
  • How about locating the desktop.el functions responsible for the behavior that you wish to change and let-bind the window-configuration-change-hook to nil during those functions? – lawlist Jun 22 at 19:34
  • I'm not sure there isn't some other user of window-configuration-change-hook that wants it to run when desktop mode restores buffers. I don't think desktop mode is doing anything "wrong". The way it works was just inconvenient for what I was trying to do. – Muir Jun 22 at 20:04
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I found that using a timer of 0 seconds before checking if the buffer is visible was enough to avoid the false positives:

(let ((buffer (current-buffer)))
  (run-with-timer 0 nil (lambda ()
                          (with-current-buffer buffer
                            (when (get-buffer-window nil t)
                              ;; do something now that buffer is visible
                              )))))

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