The branch stable/12 has been updated by bapt:

URL: 
https://cgit.FreeBSD.org/src/commit/?id=2f2bbc485f2263ab8eb9d272a22d32c06f9e94e9

commit 2f2bbc485f2263ab8eb9d272a22d32c06f9e94e9
Author:     Baptiste Daroussin <[email protected]>
AuthorDate: 2021-03-30 09:37:29 +0000
Commit:     Baptiste Daroussin <[email protected]>
CommitDate: 2021-05-05 07:16:23 +0000

    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)
---
 bin/sh/histedit.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/bin/sh/histedit.c b/bin/sh/histedit.c
index a46fe946df18..81967a8a503d 100644
--- a/bin/sh/histedit.c
+++ b/bin/sh/histedit.c
@@ -139,8 +139,10 @@ bad:
                if (el) {
                        if (Vflag)
                                el_set(el, EL_EDITOR, "vi");
-                       else if (Eflag)
+                       else if (Eflag) {
                                el_set(el, EL_EDITOR, "emacs");
+                               el_set(el, EL_BIND, "^R", "em-inc-search-prev", 
NULL);
+                       }
                        el_set(el, EL_BIND, "^I", "sh-complete", NULL);
                        el_source(el, NULL);
                }
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