GNU bug report logs - #51007
27.2; emacs hangs when using window-toggle-side-windows

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Message #26 received at 51007 <at> debbugs.gnu.org (full text, mbox):

From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 51007 <at> debbugs.gnu.org, indrajeet.khandekar <at> taranawireless.com
Subject: Re: bug#51007: 27.2; emacs hangs when using window-toggle-side-windows
Date: Sun, 10 Oct 2021 10:58:12 +0200

> What are the actual values of the data in this assertion:
>
> 	      eassert (r->glyphs[TEXT_AREA] >= fr->glyphs[TEXT_AREA]
> 		       && r->glyphs[LAST_AREA] <= fr->glyphs[LAST_AREA]);

How would I do that?  These are structures like

(gdb) p r->glyphs[TEXT_AREA]
$1 = (struct glyph *) 0xe2df90
(gdb) p fr->glyphs[TEXT_AREA]
$2 = (struct glyph *) 0xe36690

BTW, the bug is easily reproducible using the following scenario: With
a master emacs -Q in an -nw session I evaluate

(setq display-buffer-alist
      '(("\\*Info\\*" (display-buffer-in-side-window) (side . right))
        ("\\*Help\\*" (display-buffer-in-side-window) (side . top))))

If I then do

C-x 3
C-h m

and evaluate

(delete-other-windows (window-main-window))

I get the assertion violation.  If instead I do

C-x 3
C-h m
C-h i

and evaluate

(delete-other-windows (window-main-window))

Emacs hangs in redisplay.  And if instead I do

C-x 3
C-h i

and evaluate

(delete-other-windows (window-main-window))

Emacs behaves as expected.

I suppose 'delete-other-windows-internal' mangles the window dimensions
but the scenarios work on GUI frames and pass all internal checks here
so it will take me some time to sort this out ...

martin

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