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bug#23569: thing-at-point, source of slowness

From: Lars Ingebrigtsen
Subject: bug#23569: thing-at-point, source of slowness
Date: Thu, 08 Jul 2021 02:49:45 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Andreas Röhler <andreas.roehler@easy-emacs.de> writes:

> in thingatpt.el:
> ;; The function bounds-of-thing-at-point finds the beginning and end
> ;; positions by moving first forward to the end of the "thing", and then
> ;; backwards to the beginning.
> ;;;;;;;
> Also bounds-of-thing-at-point jumps to-and-fro, doing some sanity check every
> time.
> Suggest to jump first at the beginning, as backward move might be slow. 
> Avoid to-and-fro, deliver tests instead, so first try will be reliable or
> return nil.

(I'm going through old bug reports that unfortunately got little response at
the time.)

I'm not sure I understand the issue, even with the response you gave to
Eli at the time.

Do you have a test case that demonstrates this slowness, and an example
of how you'd change the code?

(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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