bug#3210: bug#3408: bug#3210: face customization fails after set-face-attribute

[Chong Yidong]

"Drew Adams" <drew.adams@oracle.com> writes:

> Bug #3408 is a _regression_, and it has not been fixed.
> A regression is certainly NOT `notabug'.

I disagree that this is a bug.  I have now taken another look at the
code, and my earlier conclusion stands.  Modifications to internal Lisp
faces (via set-face-attribute) take precedence over the effect of face
specs, so the behavior is working as intended and as documented
(including in the docstring of set-face-attribute).

The trunk now contains a change to face-spec-set which allows it to be
more easily called from Lisp code to override defface specs.  If you
want to modify faces from Lisp, use that rather than set-face-attribute.

Don't re-open this bug based on uninformed opinion.  Thanks.