bug#1297: font-lock-keywords-case-fold-search doc and usage

[Dan Nicolaescu <dann@ics.uci.edu>]

Chong Yidong <cyd@stupidchicken.com> writes:

  > > font-lock-keywords-case-fold-search docstring should make it more clear
  > > that font-lock-defaults erases it.
  > 
  > Okay, I changed it to make it hopefully clearer.

Thanks.

  > > There is one victim in the tree.  `lisp-mode' does:
  > >
  > >   (make-local-variable 'font-lock-keywords-case-fold-search)
  > >   (setq font-lock-keywords-case-fold-search t)
  > >
  > > but the value of font-lock-keywords-case-fold-search in a lisp-mode
  > > buffer is nil, that's because font-lock-defaults does a
  > > kill-local-variable on it...
  > 
  > Great catch.  No one has complained about this, so clearly it's OK for
  > font-lock-keywords-case-fold-search to be nil.  I removed the bogus
  > 8-year-old setting of font-lock-keywords-case-fold-search.

But that's not quite right, not sure about the standard, but there are
lisps that are case insensitive:

(DEFUN foo (arg)
 blah)

ought to be fontified the same was as:

(defun foo (arg)
 blah)