bug#43941: HTML+ mode: dangerous apostrophe after fullwidth parenthesis

[Eli Zaretskii]

> From: Stephen Berman <stephen.berman@gmx.net>
> Cc: 積丹尼 Dan Jacobson <jidanni@jidanni.org>,
>   43941@debbugs.gnu.org
> Date: Mon, 12 Oct 2020 17:11:01 +0200
> 
> >> The humble APOSTROPHE becomes a color change point, due to having a
> >> FULLWIDTH LEFT PARENTHESIS before it.
> >
> > I don't think it has anything to do with FULLWIDTH LEFT PARENTHESIS, I
> > think the apostrophe invokes the string face here.
> 
> But the face does not change if `(' is used instead of `（', e.g. copy
> the following two lines into a buffer and type `M-x html-mode' (or `M-x
> mhtml-mode', the face change appears in both):

So which of them is a bug?