bug#35044: 25.2; Description of "disappearing" faces (Emacs Manual)

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@gmail.com>
> Cc: Sebastian Urban <mrsebastianurban@gmail.com>,  35044@debbugs.gnu.org
> Date: Wed, 17 Apr 2019 18:37:13 -0400
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> > I very much doubt that a user who bumped into the issue like you did
> > would look in that section for the reason.  More likely, they will ask
> > a question, like you did, and get the answer you did.
> 
> Yes, but the existence of a manual page to point at lends the answers
> more authority.

Feel free to add something there, then.