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git2svn
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2021-05-05T07:25:12.175590Z
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sh: improve emacs mode

In emacs mode, force ^R to backware search the history
This behaviour is the default in emacs mode for most of the other shells

Note: Note that this can still be overridden via $EDITRC, ~/.editrc or a
bind command after set -o emacs.

Approved by:		jilles
Reviewed by:		jilles, arichardson, pstef
Differential Revision:	https://reviews.freebsd.org/D29494

(cherry picked from commit 660045fb5360d328da199ae78c89d5cc15b6d1ca)

Git Hash:   2f2bbc485f2263ab8eb9d272a22d32c06f9e94e9
Git Author: bapt@FreeBSD.org
END