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bug#39190: 28.0.50; two buffers with same buffer-file-name (diff-syntax-

From: Juri Linkov
Subject: bug#39190: 28.0.50; two buffers with same buffer-file-name (diff-syntax-fontify-props)
Date: Thu, 06 Feb 2020 00:39:19 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (x86_64-pc-linux-gnu)

>> That's the problem with the current approach: we end up making decisions
>> which can't be justified.  Whether mode hooks should be run or not
>> depends on the hook and various other things.  What we *do* know, OTOH
>> is that `vc-find-revision-no-save`s buffer is not associated with
>> a file, so setting `buffer-file-name` can result in bugs.
> delay-mode-hooks was intended as the safest workaround to install in emacs-27.

delay-mode-hooks is now in emacs-27.

> Using alternatives of buffer-file-name are not straightforward
> and need more testing in emacs-28.

I don't know how to handle this more properly because some hooks
should be run with buffer-file-name, e.g. generic-mode-find-file-hook
that uses buffer-file-name to add more font-lock highlighting.
But some hooks like in Eglot assume that buffer-file-name associates the
buffer with a file.

Also I tried to use indirect buffers:

(let ((buffer (make-indirect-buffer
               (generate-new-buffer-name (buffer-name)))))
       (with-current-buffer buffer
         (let ((buffer-file-name "/tmp/foo.el"))
     (kill-buffer buffer))))

but not sure if it's enough to just set its deduced mode.

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