bug#24480: Clicking disables track-mouse on Emacs 25.1

[Eli Zaretskii]

> From: Vincent Semeria <vincent.semeria@gmail.com>
> Date: Tue, 20 Sep 2016 09:46:45 +0200
> 
> After (set (make-local-variable 'track-mouse) t), when I click anywhere in 
> the buffer, track-mouse will be reset
> to nil.
> 
> Emacs 24.5 didn't do that. It breaks a tooltip system I have for coding in 
> C++ : I alternate between typing,
> clicking and hovering over variables to get tooltips.

Thanks, I fixed this on the emacs-25 branch.

> I cannot debug track-mouse because it is in the C layer of Emacs,
> not in lisp.

The bug was in Lisp, not in the C support code.