bug#44974: dabbrev-expand doesn't know wide commas are commas yet

[Eli Zaretskii]

> From: 積丹尼 Dan Jacobson
>  <jidanni@jidanni.org>
> Date: Tue, 01 Dec 2020 08:30:31 +0800
> 
> The command dabbrev-expand is bound to M-/.
> 
> It is great, except it needs to be updated, to know that
> "，" is a comma, just like ",".
> 
> 哇，哈<ESC />
> a,bb<ESC />
> 
> Scanning for dabbrevs...done
> user-error: No dynamic expansion for ‘哇，哈’ found
> Scanning for dabbrevs...done
> user-error: No dynamic expansion for ‘bb’ found
> 
> Note how the latter doesn't have the "a," glued to it.
> 
> That means it is operating correctly. The former needs to be updated to
> act like the latter.

This is now fixed on the master branch.

> P.S., I didn't test any other wide punctuation, e.g.. "。", etc.

I did.