GNU bug report logs - #39190
28.0.50; two buffers with same buffer-file-name (diff-syntax-fontify-props)

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From: Felician Nemeth <felician.nemeth <at> gmail.com>
To: 39190 <at> debbugs.gnu.org
Subject: bug#39190: 28.0.50; two buffers with same buffer-file-name (diff-syntax-fontify-props)
Date: Sun, 19 Jan 2020 12:14:47 +0100

If I read correctly, diff-syntax-fontify-props sets buffer-file-name of
a temporary buffer to an existing one.  This is not necessarily a bug,
but it definitely looks strange that we have two buffers with different
contents and the same buffer-file-name.

Eglot (in ELPA) runs into problems because of this
(https://github.com/joaotavora/eglot/pull/233).

Is there a recommended way to check in an after-change-major-mode-hook
whether the current buffer is or isn't a temporary diff buffer?  For
example, to check if first character of buffer-name is space.

Thank you.

In GNU Emacs 28.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.5, cairo version 1.16.0)
 of 2020-01-19 built on betli
Repository revision: 35a1a007bb7506c72ee6d9757a79014c679e7bae
Repository branch: emacs-27
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux 10 (buster)

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