Re: Emphasize the character to be typed next in *Completions*

[Richard Stallman]

    That's definitely a better approach.  Setting either face variable to nil
    should mean "don't decorate this part".

I don't think these variables are necessary.  The user can customize
the face to a no-op.

We started having variables to specify which face to use
back when customizing a face was much less convenient and less
flexible than it is now.