bug#46507: 26.1; bold attribute copied into enriched-mode text is not saved

[Eli Zaretskii]

> From: Tomas Nordin <tomasn@posteo.net>
> Date: Sun, 07 Mar 2021 20:23:05 +0100
> Cc: 46507@debbugs.gnu.org
> 
> --> '(font-lock-face eshell-ls-directory)'
> 
> and what is defined by variable 'enriched-translations'.
> 
> Try the same (your recipe) but using M-x shell, and see if it works as
> expected. It did here, I mean the boldness and the color stuck with the
> enriched file. So maybe it is not a bug but just a limitation of the
> enriched-mode, not understanding all possible kinds of text-properties.

We control which text properties enriched-mode knows about.  If
there's some property it needs to support, but doesn't currently, we
can teach it to support that property as well.