bug#14394: jit-lock-force-redisplay redefinition breaks jit fontification in auctex

[Antoine Levitt]

Hi,

A commit of Stefan Monnier in April 23 changed the API of
jit-lock-force-redisplay. First and easiest, the docstring of
jit-lock-force-redisplay was not changed, and still mentions the old BUF
argument.

Second, this breaks function font-latex-jit-lock-force-redisplay in
auctex, which uses the old prototype. This is present in emacs and
auctex from trunk. Is the prototype change really necessary? If no, this
is a bug for emacs, if yes, this is a bug for auctex. In doubt, I'm
submitting the report in both.