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bug#20146: font-lock-extend-jit-lock-region-after-change: results are di
From: |
Stefan Monnier |
Subject: |
bug#20146: font-lock-extend-jit-lock-region-after-change: results are discarded instead of being returned. |
Date: |
Fri, 20 Mar 2015 15:39:10 -0400 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
> Perhaps we could implement the convention that when a major mode has
> positively set the font-lock region's start and end points, these should
> be accepted by F/J-lock, but when not, F/J-lock should be free to alter
> them (as it typically does now).
No the core of the API is font-lock-fontify-region and it should work
with *any* bounds (i.e. if these need to be extended, it should be done
by font-lock-extend-region-function).
Jit-lock is implemented on top of that API and is hence free to use any
bounds it sees fit.
If you rely on more specific bounds being passed to
font-lock-fontify-region, that means you have a problem on your side.
> The existence of font-lock-extend-after-change-region-function makes
> this distinction possible.
The existence of font-lock-extend-after-change-region-function is an
error on my part (More specifically the result of a weakness on my part:
when you requested this feature, I added
font-lock-extend-region-function (which was the right fix) and
reluctantly accepted to also add
font-lock-extend-after-change-region-function just out of tiredness of
arguing that it was the wrong solution).
Stefan