bug#53353: 29.0.50; spurious <tab-bar> <mouse-movement> events generated by mouse motion in tab-bar

[Po Lu]

Mark Kennedy <mark.t.kennedy@gmail.com> writes:

> This bug occurs in LSP clients (observed for both scala and python) with
> many minor modes in effect.  Not feasible to reproduce from -Q.  Mouse motion 
> in
> the tab bar (over both a tab name or the white space between them)
> generates unwanted "<tab-bar> <mouse-motion>" input events (which are
> unbound).

What is the value of `track-mouse' when the bug occurs?  Thanks.