bug#26871: 25.2; Support revert-buffer for Customize buffers

[Lars Ingebrigtsen]

Phil Sainty <psainty@orcon.net.nz> writes:

> The only way I'm aware of to refresh a Customize buffer when things
> have changed externally is to kill the buffer and recreate it.
>
> It would be convenient if `revert-buffer' was supported, and bound
> to "g" as usual.

Yeah, reverting in Customize buffers can be convenient, especially when
developing (and loading new stuff), so I've added this to Emacs 28.
(But it uses the global `C-x x g' binding, because the Customize buffer
is semi-editable, so it'd be confusing (and error-prone) to bind `g' to
this outside of the editable fields.)

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