From 8527f1d5b2a988492769580f63542061742aa3ba Mon Sep 17 00:00:00 2001
From: VanessaE <vanessa.e.dannenberg@gmail.com>
Date: Thu, 21 Jan 2021 13:32:28 -0500
Subject: [PATCH] writing [ or ] into a sign breaks the form for some users

the exact effect varies with client behavior and the particular text contents.
(characters erased, disappering formspec elements, loss of text)
---
 api.lua | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/api.lua b/api.lua
index c7f2e01..9ef07c3 100644
--- a/api.lua
+++ b/api.lua
@@ -1151,7 +1151,7 @@ function get_sign_formspec(pos, nodename)
 
 	local formspec = {
 		"size[6,4]",
-		"textarea[0,-0.3;6.5,3;text;;" .. txt .. "]",
+		"textarea[0,-0.3;6.5,3;text;;" .. minetest.formspec_escape(txt) .. "]",
 		"background[-0.5,-0.5;7,5;signs_lib_sign_bg.jpg]",
 		"button_exit[2,3.4;2,1;ok;" .. S("Write") .. "]"
 	}