bug#68958: [PATCH] Support bookmarking Xref results buffers

[Dmitry Gutov]

On 07/02/2024 19:25, Juri Linkov wrote:
> > This patch adds support for bookmarking "*xref*" buffers and restoring
> > them later, even across Emacs sessions.
>
> Shouldn't 'revert-buffer-function' in the xref buffer
> be sufficient to reconstruct the buffer contents?
>
> Usually modes set buffer-local 'revert-buffer-function'
> to a lambda that reruns the top function with previous
> arguments.  But it seems xref.el doesn't set it.

I can't find my original cause for not using this variable here, so if 
replacing the command xref-revert-buffer with setting 
revert-buffer-function makes things easier for someone, I'm all for it.

> I once tried to use 'revert-buffer-function' to restore
> xref buffers from the desktop, but abandoned the idea.
> Not because xref.el doesn't set 'revert-buffer-function'.
> But because it would take too much time to restore
> the desktop while it will rerun all saved xref buffers.
>
> OTOH, saving an xref bookmark makes more sense.
> And probably your patch will help to implement
> 'revert-buffer-function' for xref as well.

I don't think bookmark would save the whole buffer contents. Would it? 
Otherwise, re-running the search(es) seems inevitable.