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

[Gregory Heytings]

> You don't need to expand the file name you pass to file-attributes: it 
> does that internally.  What you need is to expand the file name you pass 
> as the key, i.e. for the symbol you are generating from the file name.

Whoops, sorry, that's what I meant to do of course, I went too fast. 
Sorry again for the confusion.

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