Sebastian Urban <mrsebastianurban@gmail.com> writes:

> According to help-gnu-emacs thread
> (lists.gnu.org/archive/html/help-gnu-emacs/2019-03/msg00205.html) this
> is normal behaviour, but from perspective of beginner it looks like
> a bug.  Therefore I suggest a sentence or two, perhaps in chapter
> "11.12 Font lock mode", about how Font lock takes over control of
> faces when user switches to mode with defined font-lock faces leaving
> only those from this mode and turning off others (unless they have
> also property font-lock-face).

So I've been looking at this, and I think maybe the only manual change
needed is in the Elisp manual to more strongly recommend using
font-lock-face for this sort of thing: