bug#67457: 29.1; Error when dragging mode line in terminal

[Stephen Berman]

On Sun, 26 Nov 2023 20:19:45 +0200 Eli Zaretskii <eliz@gnu.org> wrote:

>> From: Visuwesh <visuweshm@gmail.com>
>> Cc: Jared Finder <jared@finder.org>,  67457@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@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?

Steve Berman