bug#20590: mouse-highlight does not do as documented

[Eli Zaretskii]

> From: Johan Bockgård <bojohan@gnu.org>
> Cc: Samuel Wales <samologist@gmail.com>,  20590@debbugs.gnu.org
> Date: Sat, 16 May 2015 22:06:02 +0200
> 
> >  . emacs -Q
> >  . C-h v mouse-highlight RET
> >  . move the mouse pointer above the hyper-link labeled "C source code"
> >    and observe the highlight
> >  . type some character -- the highlight stays on
> >  . M-x set-variable RET mouse-highlight RET 1 RET
> >  . type some character -- the highlight goes off
> >  . move the mouse pointer a bit -- the highlight goes on
> >
> > So the highlight behaves as documented for me.
> >
> > For the record, I tried both Emacs 24.4, which is what you seem to
> > have, and the latest development sources.
> 
> The problem was introduced by
> 
> commit 742516e02048d3bbfba4e6e13dd19afa097bbd3b
> Author: Dmitry Antipov <dmantipov@yandex.ru>
> Date:   Wed Sep 11 12:56:33 2013 +0400
> 
>     Ifdef away frame tool bar code when it is not really used.
>     ...
> 
> 
> The bug does not exist on Windows. I think this should fix it:

Looks good to me, please push.

Thanks.