GNU bug report logs - #22763
25.1.50; Feature Request -- A faster method to obtain line number at position.

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Package: emacs;

Reported by: Keith David Bershatsky <esq <at> lawlist.com>

Date: Mon, 22 Feb 2016 02:44:01 UTC

Severity: wishlist

Tags: fixed

Found in version 25.1.50

Fixed in version 28.1

Done: Lars Ingebrigtsen <larsi <at> gnus.org>

Bug is archived. No further changes may be made.

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Message #127 received at 22763 <at> debbugs.gnu.org (full text, mbox):

From: Ben Levy <blevy <at> protonmail.com>
To: "22763 <at> debbugs.gnu.org" <22763 <at> debbugs.gnu.org>
Subject: Re: bug#22763: 25.1.50;
 Feature Request -- A faster method to obtain line number at position.
Date: Thu, 20 May 2021 20:40:31 +0000

> Please explain the connection.

Here's a minimal example (sorry I didn't try to do this earlier):

(with-temp-buffer
  (insert "foo\nbar\nbaz")
  (narrow-to-region 4 5)
  (message "%s" (line-number-at-pos 1 t)))

On the latest master (ef7a6eec20), this errors with

Args out of range: 1, 4, 5

But on emacs-27.2, it prints "1".

From what I can tell, this is because the lisp version of line-number-at-pos
allowed the argument to be outside the visible range, and it widened before
counting lines to allow this.
This bug report was last modified 3 years and 364 days ago.

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