From 3d0bfb0a003b8f6816be05bb899db08f3a9b8423 Mon Sep 17 00:00:00 2001
From: Benno Schulenberg <bensberg@telfort.nl>
Date: Sat, 15 Aug 2020 13:18:48 +0200
Subject: [PATCH] input: do not enter invalid bytes when holding down both Alt
 keys

This fixes https://savannah.gnu.org/bugs/?58954.

Bug existed since version 5.1, commit 49231191.
---
 src/winio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/winio.c b/src/winio.c
index 78c0a7e2..afef1d4c 100644
--- a/src/winio.c
+++ b/src/winio.c
@@ -939,7 +939,7 @@ int parse_kbinput(WINDOW *win)
 												keycode == DEL_CODE)
 				return CONTROL_SHIFT_DELETE;
 #endif
-			else if (!solitary)
+			else if (!solitary && keycode < 0x20)
 				meta_key = TRUE;
 		} else if (key_buffer_len == 0 || *key_buffer == ESC_CODE ||
 								(keycode != 'O' && keycode != '[')) {