GNU bug report logs - #54038
29.0.50; doc-view cannot show different pages in different tabs

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From: martin rudalics <rudalics <at> gmx.at>
To: Juri Linkov <juri <at> linkov.net>
Cc: 54038 <at> debbugs.gnu.org
Subject: bug#54038: 29.0.50; doc-view cannot show different pages in different tabs
Date: Thu, 24 Feb 2022 10:18:57 +0100

>> We might be able to provide such a function but can you tell me why you
>> would need it and how you would use it?
>
> It could be used in 'image-mode-winprops':
>
>    (when cleanup
>      (setq image-mode-winprops-alist
>    	  (delq nil (mapcar (lambda (winprop)
> 			      (let ((w (car-safe winprop)))
> 				(if (or (not (windowp w))
>                                          (window-live-p w)
>             new function =>              (window-live-in-all-window-configurations w))
> 				    winprop)))
>    			    image-mode-winprops-alist))))

I can't tell from here what 'window-live-in-all-window-configurations'
is supposed to return.  Its name appears misleading - do we care if 'w'
is live in a configuration of another frame but w's?  So please tell me
the doc-string of ‘window-live-in-all-window-configurations’ first.

And please always keep in mind: The only agent that has access to _all_
window configurations is the garbage collector.  If we wanted to change
that, we'd have to make window configurations explicitly deletable like
buffers or windows with functions like 'make-window-configuration',
'delete-window-configuration' and 'window-configurations-list'.  While
this might not pose great problems for read_minibuf, it certainly will
for configurations in plain Lisp code which all of a sudden would become
noncollectable after the last reference to them has gone ...

martin

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