RE: read-face-name PROMPT arg should be self-contained, including ": "

[Drew Adams]

>     `read-face-name' still blindly appends ": " to the prompt it
>     is supplied.
>
> I thought of `read-face-name' as an internal function, not for
> users to use.
> But I agree that it could be useful for user code to call.
> So I'm not against making this change.  I see that all the callers
> within Emacs are easy to change.
>
> If someone wants to do it, please do it.

Thanks, I hope someone does.

BTW, for sometime after the release, we might consider adding an optional
history-list arg to `read-face-name', so accessing history entries doesn't
include non-face stuff.