Hello.

Currently when a user performs some REPL operation using Emacs UI –
e.g. installs a package from *Guix Package Info* buffer, information in
that buffer stays the same, and he needs to press "g" there to revert
the buffer.

The attached patches will add that missing feature: after finishing a
REPL operation, a buffer from which this operation was performed will be
automatically updated.  This auto-updating may be disabled with:

  (setq guix-update-after-operation nil)