GNU bug report logs - #67457
29.1; Error when dragging mode line in terminal

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From: Jared Finder <jared <at> finder.org>
To: Stephen Berman <stephen.berman <at> gmx.net>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 67457 <at> debbugs.gnu.org, Visuwesh <visuweshm <at> gmail.com>
Subject: bug#67457: 29.1; Error when dragging mode line in terminal
Date: Sun, 26 Nov 2023 16:24:46 -0800

On 2023-11-26 14:08, Stephen Berman wrote:
> On Sun, 26 Nov 2023 20:19:45 +0200 Eli Zaretskii <eliz <at> gnu.org> wrote:
> 
>>> From: Visuwesh <visuweshm <at> gmail.com>
>>> Cc: Jared Finder <jared <at> finder.org>,  67457 <at> debbugs.gnu.org
>>> Date: Sun, 26 Nov 2023 23:39:45 +0530
>>> 
>>> [ஞாயிறு நவம்பர் 26, 2023] Eli Zaretskii wrote:
>>> 
>>> >> Date: Sun, 26 Nov 2023 09:31:26 -0800
>>> >> From:  Jared Finder via "Bug reports for GNU Emacs,
>>> >>  the Swiss army knife of text editors" <bug-gnu-emacs <at> gnu.org>
>>> >>
>>> >> When in a terminal with the tab-line showing and mouse enabled, the
>>> >> following error in shown when dragging the mode line down:
>>> >>
>>> >> <tab-line> <mouse-movement> is undefined
>>> >
>>> > Thanks, but I cannot reproduce this, at least not on MS-Windows (I
>>> > don't have access to a Posix system with a mouse-capable text
>>> > terminal).
>>> 
>>> I can reproduce this in xterm in master branch commit
>>> 2fca889cfb4fa495a6ffa0c7fe368551ee9a32bc.
>> 
>> Thanks.
>> 
>> And the fix solves the problem?
> 
> I can also reproduce the problem on GNU/Linux with emacs-29 and master,
> and the fix works for me.
> 
>> Does anyone have a Linux terminal with GPM mouse and can test there?
> 
> I do and after splitting the window and enabling gpm-mouse-mode I can't
> drag the mode line with GPM mouse at all, whether global-tab-line is
> enabled or not (on emacs-29 and master), and there are no errors or
> other notifications in *Messages*.  Is dragging the mode line
> supposed to work in the Linux terminal with GPM mouse?

I also have a GPM mouse available and I see different behavior.

On Emacs 28.2 (installed from Debian package): Dragging the mode line 
works fine, even if the tab line is visible. (GPM mouse mode is enabled 
by default)

On HEAD (2407f8): Dragging the mode line does not work until I disable 
and re-enable GPM mouse mode. Then it works fine.

This indicates two things to me:

1. My original patch is likely inaccurate.  A better fix would be to 
align the mouse-movement event with how it is emitted under GPM and DOS. 
 I will investigate.

2. Something broke with how GPM mouse mode is enabled between Emacs 28.2 
and HEAD.  I can help with a bisect here.

  -- MJF

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