GNU bug report logs - #78777
30.1; insert-file-contents should not set buffer-file-name to nil

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From: Jimmy Yuen Ho Wong <wyuenho <at> gmail.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, 78777 <at> debbugs.gnu.org
Subject: bug#78777: 30.1; insert-file-contents should not set buffer-file-name to nil
Date: Sat, 21 Jun 2025 14:16:48 +0100

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> An alternative is to go back to using replace-buffer-content.  If its
> default operation is (or could be) too slow, you should be able to
> avoid that by passing zero for the MAX-SECS argument.
>

This is not a great solution. The point and mark will often move far away
from where it was after replacing content, even inside a
save-mark-and-incursion. There is a [RCS patch algorithm](
https://github.com/radian-software/apheleia/blob/main/apheleia-rcs.el)
available in a third party package, but there's no built-in Emacs function
that can do better than insert-file-contents in terms of speed and behavior.

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