bug#44294: No widen by xref-find-definitions

[Juri Linkov]

>> > -       (user-error "Rerun etags: `%s' not found in %s"
>> > -                      pat buffer-file-name)))
>> > +       (if (or (= (point-min) 1) (not widen-automatically))
>>
>> Couldn't a buffer be narrowed, but point-min still be equal to 1?
>
> Yes, this should be (eql (buffer-size) (- (point-max) (point-min)).

It's nice that you arrived to the same code that is used in the
existing function buffer-narrowed-p (I missed it before).