Optionally avoid that switching to previous or next buffer shows that buffer twice.
* window.el (switch-to-visible-buffer): New option. (switch-to-prev-buffer, switch-to-next-buffer): Observe switch-to-visible-buffer. Make sure that checking for a window showing a buffer already is done on the same frame. * windows.texi (Window History): Describe new option switch-to-visible-buffer.
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