Re: tab-bar: Defining another mouse-button binding?

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: adam@alphapapa.net,  emacs-devel@gnu.org
> Date: Fri, 10 Sep 2021 19:19:39 +0300
> 
> > The real message text is
> >
> >   <nil> <wheel-down> is undefined
> >
> > and similarly for wheel-up.
> 
> Thanks for clarification.  Actually, there is already such bindings:
> 
>     (define-key map [wheel-up]    'tab-previous)
>     (define-key map [wheel-down]  'tab-next)
> 
> So the problem is that it emits <nil> instead of <tab-bar>.
> And as I understand, the same <nil> is emitted on the tab-line
> instead of <tab-line> on GUI frames and on TTY frames.

Yes, that's the problem.