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

[Gregory Heytings]

> > I don't know what I should do here.  Both Stefan and Lars think (IIUC) 
> > that it's okay to use the filename as is.
>
> No: the hash table should be indexed by absolute file names. Anything 
> else will lead to bugs. There are various ways to get those names to be 
> absolute, with tradeoffs.

Okay, so there were three opinions, not two ;-)

Here's an again improved version, which I hope is a reasonable compromise.

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