bug#35353: 26.2; Buffer *xref*: (1) hard-coded mouse-1, (2) major mode name

[Drew Adams]

> > > So we already support mouse-1 clicks, don't we?  Or am I again missing
> > > something?
> >
> > Yes, but apparently we don't honor mouse-1-click-follows-link.
> 
> FWIW, I don't see that as a serious issue in this case.  Feel free to
> close as wontfix, if you want.

Seriously?  Mouse-2 was the original way to follow
links.  And ubiquitously in Emacs users need to be
able to set point.  They should be able to do so
using `mouse-1'.

We have `mouse-1-click-follows-link' for a reason.
Why should this be the only place (AFAIK) in Emacs
where it is not respected?  Any user who uses nil
for that option will find Xref unusable.

Not to mention that this violates the explicit Emacs
convention (cited earlier).