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

[Stefan Monnier]

> I have in my .emacs file only these two lines:
>
>     (custom-set-variables
>      '(font-lock-keywords-case-fold-search t))

How did you end up with that?
font-lock-keywords-case-fold-search is not a customize variable, so you
should not set it with custom-set-variables.

> Then if I visit an empty or nonexistent C file and just type "LONG"
> (in all caps or with at least one letter being capital), Emacs will
> hang after typing the final G but before the G appears on screen

Clearly not a desirable behavior, indeed, but the above var setting is
clearly a pilot error.  Of course

    (setq-default font-lock-keywords-case-fold-search t)

would give the same result, but I'd also argue that it'd be
a pilot error.


        Stefan