bug#51794: 29.0.50; invalid input events generated from a mouse click for the tab bar

[Eli Zaretskii]

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> From: Mark Kennedy <mark.t.kennedy@gmail.com>
> Date: Sat, 13 Nov 2021 08:37:37 -0500
> 
> it doesn't rebind anything significant.  but i'm not sure that theory
> could explain the key sequence '<nil> <mouse-1>' unless it had
> mistakenly bound it to a keyboard macro?  what do you think the
> presence of the '<nil>' as a keyboard event means?  from where could
> that originate?

That nil means Emacs didn't recognize the part of the window/frame
where you clicked.

Is it possible to provide a complete recipe for reproducing the
problem, starting from "emacs -Q" and loading the minimum number of
additional features required for seeing the problem?