GNU bug report logs - #77221
[PATCH] modification hooks are called 3x for each yank

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: JD Smith <jdtsmith <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: [PATCH] modification hooks are called 3x for each yank
Date: Sun, 23 Mar 2025 18:14:03 -0400

[Message part 1 (text/plain, inline)]

Evaluate:

 (add-hook 'after-change-functions (lambda (beg end len) (message "GOT %s->%s [%s]" beg end len)) nil t)

Then yank text.  You'll see the before/after change functions are called 3x upon each yank.  This is due to the final text property changes made by `insert-for-yank-1'.  For substantial amounts of yanked text, this is inefficient.  

Patch attached.

[0001-Limit-yanks-to-a-single-set-of-modification-hook-cal.patch (application/octet-stream, attachment)]

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