bug#38563: 27.0.50; Company popup renders with newlines (?) inheriting the bg properties of the character at next line's bol

[Eli Zaretskii]

> Date: Fri, 13 Dec 2019 10:22:55 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 38563@debbugs.gnu.org
> 
> > It looks fixed in the whitespace-mode example, but not in the other one.
> > 
> > Just call M-x company-complete-common on the "Author:" line in a LogEdit 
> > buffer to reproduce. (I've tested common d7efe98951).
> 
> That's not a bug: the face on that thin line on whose first character
> you put the tooltip overlay has a non-nil :extend attribute, so
> Company will have to explicitly say ':extend nil' in its face(s) to
> countermand that.

Actually, this won't work.  Let me think some more about this
situation.