GNU bug report logs - #76911
dedicated side windows lose their dedication upon reuse

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Message #11 received at 76911 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>, Daniel Colascione <dancol <at> dancol.org>
Cc: 76911 <at> debbugs.gnu.org
Subject: Re: bug#76911: dedicated side windows lose their dedication upon reuse
Date: Mon, 10 Mar 2025 18:47:21 +0100

>> Consider the code below:
>>
>>      (let ((b1 (get-buffer-create "*b1*"))
>>            (b2 (get-buffer-create "*b2*"))
>>            (action '(display-buffer-in-side-window
>>                      (dedicated . t)
>>                      (side . left))))
>>        (display-buffer b1 action)
>>        (sit-for 1)
>>        (display-buffer b2 action))
>>
>> It puts b1 in a side window, then reuses that side window for b2.
>> When we display b2, the window loses the strong dedication it had to b1
>> despite the display action for b2 including a request for a
>> dedicated window.
>>
>> I'd expect the window to be dedicated to b2 at the end of the
>> above snippet.
>
> Martin, any comments?

The following emacs -Q example shows what may happen then:

(let* ((b1 (get-buffer-create "*b1*"))
       (b2 (get-buffer-create "*b2*"))
       (b3 (get-buffer-create "*b3*"))
       (action '(display-buffer-in-side-window
                 (dedicated . t)
                 (side . left)))
       (window (display-buffer b1 action)))
  (message "%s" (window-dedicated-p window))
  (sit-for 3)
  (display-buffer b2 action)
  (message "%s" (window-dedicated-p window))
  (sit-for 3)
  (display-buffer b3 t))

*b3* is shown in the side window although this is reserved for buffers
displayed via 'display-buffer-in-side-window'.

I checked in a fix.  Please try again.

Thanks for the report, martin

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