GNU bug report logs - #77985
31.0.50; infinite loop in `make-frame-names-alist`

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From: martin rudalics <rudalics <at> gmx.at>
To: Al Haji-Ali <abdo.haji.ali <at> gmail.com>, Eli Zaretskii <eliz <at> gnu.org>
Cc: 77985 <at> debbugs.gnu.org
Subject: bug#77985: 31.0.50; infinite loop in `make-frame-names-alist`
Date: Sun, 27 Apr 2025 10:22:55 +0200

[Message part 1 (text/plain, inline)]

>> Sure, but here the loop is explicit in the looping program, so it
>> could prevent the infloop.
>
> Indeed, I thought a loop like this would work without changing the documented behaviour as far as I can see:
>
> ,----
> | (let ((current-frame (selected-frame))
> |       prev-frame
> |       frame)
> |   (while (and
> |           (not (eq frame current-frame))
> |           (not (eq frame prev-frame)))
> |     (setq
> |      prev-frame frame
> |      frame (next-frame frame 0))))
> `----

Whatever we do here we won't fix the principal problem with next_frame
namely that

(progn
  (set-frame-parameter nil 'no-other-frame t)
  (next-frame nil 0))

can loop forever.  I attach a patch that should fix the problems with
'make-frame-names-alist' and 'delete-other-frames' using 'frame-list' as
base.

martin

[frame-list-1.diff (text/x-patch, attachment)]

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