commit 5b29c678702d6e9e8fde48eb9f638dcb4267c212
Author: christos <christos@NetBSD.org>
Date:   Sat Aug 21 12:38:56 2021 +0000

    PR/56370: mirabilos: libedit change from 2017 kills history in gdb

diff --git a/lib/libedit/readline.c b/lib/libedit/readline.c
index cbae11f5a21..f4219bb3fb3 100644
--- a/src/readline.c
+++ b/src/readline.c
@@ -2078,6 +2078,7 @@ rl_callback_read_char(void)
 	const char *buf = el_gets(e, &count);
 	char *wbuf;
 
+	el_set(e, EL_UNBUFFERED, 1);
 	if (buf == NULL || count-- <= 0)
 		return;
 	if (count == 0 && buf[0] == e->el_tty.t_c[TS_IO][C_EOF])
@@ -2093,7 +2094,6 @@ rl_callback_read_char(void)
 		} else
 			wbuf = NULL;
 		(*(void (*)(const char *))rl_linefunc)(wbuf);
-		el_set(e, EL_UNBUFFERED, 1);
 	}
 }
 
@@ -2111,9 +2111,8 @@ rl_callback_handler_install(const char *prompt, rl_vcpfunc_t *linefunc)
 void
 rl_callback_handler_remove(void)
 {
+	el_set(e, EL_UNBUFFERED, 0);
 	rl_linefunc = NULL;
-	el_end(e);
-	e = NULL;
 }
 
 void