bug#28852: make revert-buffer ('g') in VC diff buffers keep point

[Lars Ingebrigtsen]

Lars Ingebrigtsen <larsi@gnus.org> writes:

> This will restore point to the same point it was before...  but not to
> "where it was", necessarily, I think? 

I was confused about how these functions worked.  I've respun the patch
for Emacs 29, and it seem to work very well, so I've now pushed it.

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