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

[Drew Adams]

> > > I'm not sure I follow: currently, mouse-2 does "follow the link"
> > > already,
> >
> > It calls xref--mouse-2, see xref--button-map.
> > That function displays the location, but keeps the Xref window selected.
> >
> > > and I believe this bug report will be satisfied if we cause
> > > mouse-1 to do the same when mouse-1-click-follows-link is in effect.
> > > And mouse-1 is not currently bound in Xref buffers.
> >
> > ?? It's bound to xref-goto-xref, see the same map.
> 
> Sorry, I just looked in the manual.
> So we already support mouse-1 clicks, don't we?
> Or am I again missing something?

What do you mean by "support mouse-1 clicks"?
We support them following a link, but we don't
support them not following a link.

`mouse-1' clicks follow the link, regardless of
`mouse-1-click-follows-link'.  When that variable
is nil a `mouse-1' click should not follow a link.

In the nil case it should typically (default
behavior) just set point (or begin a region drag) -
`mouse-drag-region' for `down-mouse-1' and
`mouse-set-point' for `mouse-1'.