Merge branch 'pw/rebase-i-regression-fix' into maint

Just the first one of three? new tests that follows up a regression
fix.

* pw/rebase-i-regression-fix:
  rebase -i: add missing newline to end of message
  rebase -i: silence stash apply
  rebase -i: fix reflog message

sequencer.c

@@ -1913,11 +1913,13 @@ static int apply_autostash(struct replay_opts *opts)
 	strbuf_trim(&stash_sha1);
 
 	child.git_cmd = 1;
+	child.no_stdout = 1;
+	child.no_stderr = 1;
 	argv_array_push(&child.args, "stash");
 	argv_array_push(&child.args, "apply");
 	argv_array_push(&child.args, stash_sha1.buf);
 	if (!run_command(&child))
-		printf(_("Applied autostash."));
+		printf(_("Applied autostash.\n"));
 	else {
 		struct child_process store = CHILD_PROCESS_INIT;
 
@@ -2088,6 +2090,7 @@ static int pick_commits(struct todo_list *todo_list, struct replay_opts *opts)
 				res = error(_("could not read orig-head"));
 				goto cleanup_head_ref;
 			}
+			strbuf_reset(&buf);
 			if (!read_oneliner(&buf, rebase_path_onto(), 0)) {
 				res = error(_("could not read 'onto'"));
 				goto cleanup_head_ref;