GNU bug report logs - #50721
Wrong point position or display while moving point

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Message #8 received at 50721 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Cos Chan <rosettas <at> gmail.com>
Cc: 50721 <at> debbugs.gnu.org
Subject: Re: bug#50721: Wrong point position or display while moving point
Date: Tue, 21 Sep 2021 17:25:02 +0300

> From: Cos Chan <rosettas <at> gmail.com>
> Date: Tue, 21 Sep 2021 14:26:44 +0200
> 
> To change system tab width by
> $ tabs 4
> would create a problem that the display is wrong while moving point (for example M-b/M-f/C-up/C-down or
> kill words/line).
> The point or the characters would be in the wrong places until I manually run M-x redraw-display to get it
> back.
> 
> I may reproduce this problem in Debian 10, 11 and FreeBSD 12, 13. Tested in zsh and tcsh by add tabs 4
> into .zshrc and .tcshrc

Thanks.

We initialize the tab width used for display on TTY frames from the
"tw" termcap/terminfo capability.  Does anyone know whether this is
updated by the 'tabs' command?  If not, is there a way Emacs could
know that the tab stops have been changed from their usual default?

If everything else fails, I guess we could provide a variable to
disable using TAB characters in cursor motion on TTYs, then users who
do the above could control how Emacs behaves in this case.

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