Re: [Emacs-trunk-diffs] Changes to emacs/lisp/faces.el

[Richard Stallman]

    This is a very useful feature which makes visually more noticeable
    all potentially dangerous control characters or other special glyphs
    which doesn't correspond to a character.

Ok, I can see that that could be useful.  But implementing it
by setting up a default display table is a kludge.  The right way
is to change the code that implements the standard display conventions,
to make it use the desired face when it generates these glyphs.