GNU bug report logs - #33458
27.0.50; dired loses position when reverted from outside place

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From: martin rudalics <rudalics <at> gmx.at>
To: Juri Linkov <juri <at> linkov.net>
Cc: 33458 <at> debbugs.gnu.org
Subject: bug#33458: 27.0.50; dired loses position when reverted from outside place
Date: Tue, 18 Dec 2018 09:28:55 +0100

> Is it really possible to get a window from the window-configuration
> that is currently not displayed and change its window-point, e.g.
> to get window reference from the buffer-local list, select with
> with-selected-window and call set-window-point?  I never tried such thing.

The window object is fully available, just its buffer (aka contents)
slot is nil.  We cannot select it and setting any geometry related
things might cause problems.  But I see no problems changing its point
or its buffer (the latter being temporarily in the combination_limit
slot).  So the problem is not how to get the window from the
configuration but how to get the configuration in the first place.

> It's clear from you explanation what harm is from zombie windows.
> But it's interesting to know is it possible to catch the moment
> when we unshow that buffer in a window?

In a zombie window?  We simply don't unshow a buffer in it because
there is no way to see a zombie window unless it gets restored via
'set-window-configuration'.  This means that 'kill-buffer' will leave
the buffer in any zombie window until all references to configurations
referencing it are removed and the window gets no more marked.
Neither replace_buffer_in_windows nor replace_buffer_in_windows_safely
can see zombie windows.

martin

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