GNU bug report logs - #78980
31.0.50; C-z crashes emacsclient -nw

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From: martin rudalics <rudalics <at> gmx.at>
To: Gerd Möllmann <gerd.moellmann <at> gmail.com>, Pip Cet <pipcet <at> protonmail.com>
Cc: 78980 <at> debbugs.gnu.org, Eli Zaretskii <eliz <at> gnu.org>
Subject: bug#78980: 31.0.50; C-z crashes emacsclient -nw
Date: Wed, 9 Jul 2025 17:09:41 +0200

> I find more interesting what redisplay_internal does. The first thing
> I see is
>
> xdisp.c:
> 17387       /* If this is a window on a tty root frame displaying a child frame,
> 17388          the current matrix of W may contain glyphs of that child frame.
> 17389          Don't try shortcuts that might use the current matrix in this case.  */
> 17390       && !is_tty_root_frame_with_visible_child (XFRAME (w->frame)))
>
> Here w->frame can be invisible, apparently. And I wonder if one should
> check if the root frame of w->frame is visible as a starter. Something
> like `FRAME_VISIBLE_P (root_frame (XFRAME (w->frame)))` before checking
> `is_tty_root...`. Because I wonder if that wouldn't be more correct also
> in the GUI case.
>
> And there are potentially more places. I don't see at the moment if
> that's already done somewhere in redisplay_internal, but maybe we should
> discard redisplays for invisible frames somewhere further down, too. Or
> one could first add assert that frames are visible when we display them,
> e.g. in redisplay_window and so on?

There is one loose end for GUIs: When I have a child frame marked as
visible, its parent frame is marked as invisible and their root frame is
marked as visible, then I have no idea whether there exists a window
manager that expects us to redraw the child frame marked as visible.  At
least when that child frame corresponds to a modal window.

martin

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