bug#37137: Setting font-lock-case-fold-search to t causes hangs on certain types in c-mode

[Stefan Monnier]

> I inherited this .emacs file from someone else who had this
> set.  I'm guessing it used to be customizable?

AFAICT it's never been custom-izable, and it really would be weird for
it to be.  I think it's more likely that this custom-set-variables was
hand-edited.

> I can just change the regexps I am using in
> font-lock-add-keywords.

That's a much safer approach.  You can also do

    (add-hook '<foo>-mode-hook
      (lambda ()
        (setq-local font-lock-case-fold-search t)))

for the specific mode where you need it: it may break the font-locking
of that mode, but if it does, at least the breakage will be limited to
that mode.


        Stefan