bug#46300: 28.0.50; Move revert-buffer global binding into a prefix map

[Lars Ingebrigtsen]

Sean Whitton <spwhitton@spwhitton.name> writes:

> Here's a patch doing that, since this seems like a solution which
> satisfies most.  Exactly what else to bind into that map I leave to
> others, for now, anyway.

Thanks; applied to Emacs 28 (but I changed the binding to `C-x x g' to
avoid the Magit collision).

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