bug#71466: 30.0.50; Buffer-menu-group-by non-nil resets point when Buffer List is reverted

[Eli Zaretskii]

> From: Eshel Yaron <me@eshelyaron.com>
> Cc: dmitry@gutov.dev,  71466@debbugs.gnu.org,  juri@linkov.net
> Date: Tue, 18 Jun 2024 16:01:40 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >>  @item g
> >> -@findex xref-revert-buffer
> >> -Refresh the contents of the @file{*xref*} buffer
> >> -(@code{xref-revert-buffer}).
> >> +Refresh the contents of the @file{*xref*} buffer (@code{revert-buffer}).
> >> +@xref{Reverting}.
> >
> > Why remove the index entry?  It needs to be rewritten, not removed.
> 
> The index entry is for xref-revert-buffer, which we're making obsolete
> here in favor of revert-buffer, which has its own index entry elsewhere.
> How do you suggest rewriting it instead?

Like this:

  @cindex revert-buffer, in @file{*xref*} buffers

And please move it before "@item g", so that following the index entry
with 'i' in Info lands on the line showing `g', not the line after it.

> >> -(defun xref-revert-buffer ()
> >> +(defun xref--revert-buffer (&rest _)     ; Ignore `revert-buffer' args.
> >>    "Refresh the search results in the current buffer."
> >
> > And I wonder why you preferred a backward-incompatible change to a
> > backward-compatible one:
> 
> This is intended to be (basically) fully backward-compatible:
> xref-revert-buffer becomes an alias of revert-buffer, which does exactly
> what xref-revert-buffer would do.

Yes, but why not leave xref-revert-buffer alone, under its original
name?

> > leave the function's name alone, and just set up
> > revert-buffer-function to invoke it.  Was this not possible for some
> > technical reason that evades me?
> 
> It's possible, and it's more or less what I suggested upthread, but
> Dmitry correctly noted that this approach (using xref--revert-buffer)
> improves backward-compatibility in the following sense: users that
> currently invoke xref-revert-buffer not by pressing 'g', but in some
> other way, can continue to do so and get the same behavior that now
> revert-buffer provides when you press 'g'.  Since revert-buffer does
> more than just calling revert-buffer-function (namely, it also runs
> revert-buffer-restore-functions), making xref-revert-buffer an alias of
> revert-buffer ensures invoking and xref-revert-buffer and pressing 'g'
> continues to behave the same.

But the original xref-revert-buffer didn't do all those other things,
did it?  So invoking it directly will be more similar to what that did
before.