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From: | Dmitry Gutov |
Subject: | bug#56682: Fix the long lines font locking related slowdowns |
Date: | Sat, 13 Aug 2022 10:58:24 +0300 |
I can only repeat that the only ways to improve font locking in a non-local
way (or at least, the only ways that were identified in the discussions so
far) are either to improve the speed of syntax-ppss by an order of
magnitude, in which case it would perhaps become feasible to allow
syntax-ppss to have access to the whole buffer, or to equip syntax-ppss with
heuristics to make it work "as well as possible" even when it only has
access to a portion of the buffer.
But the locked narrowing is applied based on the presence of long-lines
rather than based on the total size of the buffer.
I think we'll want to decouple the two because they aren't quite the
same
Indeed.(e.g. in many cases the time taken by `syntax-ppss` doesn't depend
on the length of lines, whereas the time taken by `font-lock-keywords`
rues does not depend on the total buffer size).
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