bug#35376: 26.2; (emacs) `Xref Commands' - no mention of `mouse-1'

[Lars Ingebrigtsen <larsi@gnus.org>]

Dmitry Gutov <dgutov@yandex.ru> writes:

>> The mouse bindings are a bit confusing:
>> (defvar xref--button-map
>>    (let ((map (make-sparse-keymap)))
>>      (define-key map [mouse-1] #'xref-goto-xref)
>>      (define-key map [mouse-2] #'xref--mouse-2)
>>      map))
>> Why is the command called xref--mouse-2?  That's a very
>> non-descriptive
>> command name.
>
> It's been that way from the beginning. You can rename it, I think, if
> you have a better name in mind.

Now renamed and updated the documentation to mention mouse-1 and
mouse-2.

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