Re: Mysterious fontification/C++ context issue

[Chong Yidong]

address@hidden (Kim F. Storm) writes:

>> 3. All this is still awfully slow and expensive: Open a larger buffer
>> like xdisp.c, jump to its end, hit M-v a couple of times, and look at
>> CPU consumption.
>
> I can second that.  Working on xdisp.c has become awfully slow lately.
> We definitely need to fix this before the release!

I'm third.

Could we set open-paren-in-column-0-is-defun-start to t for c mode?
This gives the old behavior, which, though incorrect in corner cases,
is at least usable.  Individual users can set it back to nil if
slow-but-correct fontification is desired (and it's irrelevant for
anyone but Emacs hackers anyway).

As for RMS's suggestion of writing a beginning-of-defun-function, I
don't see any dramatic optimizations that we could employ to make that
a solution for this (apart from, well, assuming that open parens in
column zero are defun starts :-).