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

[Visuwesh]

[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.

>> Steps to reproduce:
>> 
>> emacs -Q -nw
>> M-x global-tab-line-mode
>> M-x xterm-mouse-mode
>> C-x 2
>> Attempt to drag the mode line down
>
> Does it matter which part of the mode line you drag?

It doesn't seem to matter.  I pulled from the final '----' part and
could reproduce the message.