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Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%
From: |
Alan Mackenzie |
Subject: |
Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7% |
Date: |
Thu, 2 Sep 2021 19:24:51 +0000 |
Hello, Stefan.
On Thu, Sep 02, 2021 at 14:46:51 -0400, Stefan Monnier wrote:
> >> > However, this mechanism is rendered ineffective if a second function
> >> > is add-hook'd onto jit-lock-functions. Maybe this could be fixed,
> >> > though it looks difficult.
> >> I think we can "easily" handle this specific case if the
> >> `bug-reference-prog-mode` function is added to the end of the hook
> >> rather than to its beginning and use a patch along the lines of the
> >> one below.
> > Yes. How about an optional parameter to jit-lock-register meaning "put
> > this function at the beginning of jit-lock-functions", with the default
> > meaning put the function at the end?
> Sure. Basically, the idea is that the function which is most likely to
> grow the bounds (or to grow them most) should come first.
OK, thanks.
> > I haven't tried it, but I don't think the patch below is quite enough.
> I'd be surprised if it is, indeed, I just thought it was a better
> description of the intention than whatever I could come up in words.
Sorry, I didn't pick that up. But I think I've worked out how to do it.
In words (;-), only the first function on jit-lock-functions should be
able to expand the region which gets `fontified' text properties. This
expanded region will then be supplied to the subsequent functions.
Given how little used the `jit-lock-bounds' mechanism is (there is one
function in Emacs, font-lock-default-fontify-region, which uses it, and
a web search revealed only a single other instance, in lsp-mode on
git-hub), this shouldn't cause problems. In fact, I'm not sure the
lsp-mode use of it is even correct.
> Stefan
--
Alan Mackenzie (Nuremberg, Germany).
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, (continued)
Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/01
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/02
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Alan Mackenzie, 2021/09/02
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/02
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%,
Alan Mackenzie <=
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Alan Mackenzie, 2021/09/02
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/03
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Stefan Monnier, 2021/09/04
- Re: bug-reference-prog-mode slows down CC Mode's scrolling by ~7%, Eli Zaretskii, 2021/09/04