bug#51523: 29.0.50; gnus-mime-view-part-externally very slow

[Gregory Heytings]

> > -        (sym (concat (symbol-name tag) "@" file))
> > +        (sym (concat (symbol-name tag) "@"
> > +                      (if (file-name-absolute-p file)
> > +                          file
> > +                        (expand-file-name file))))
>
> (cons tag (if (file-name-absolute-p file) file (expand-file-name file)))
>
> is more efficient.

I don't see a performance impact in my tests, but I'll trust the master.

Further-improvement-of-file-has-changed-p.patch
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