Touchscreen fixes

touchscreen.lua

@@ -18,9 +18,9 @@ local function create_element_string(element, values)
 end
 
 local function modify_element_string(old, values)
-	local e = string.match(old, "^(.-)%[")
+	local e = string.match(old, "^(.-)%[[^[]*%]$")
 	local element = formspec_elements[e]
-	if type(element) == "function" then
+	if type(element) ~= "table" then
 		return old  -- No-op for special elements, as there is no format string
 	end
 	local old_values = {string.match(old, element[5])}
@@ -156,7 +156,10 @@ local function create_formspec(meta, data)
 	if meta:get_int("no_prepend") == 1 then
 		fs = fs.."no_prepend[]"
 	end
-	if not meta:get("real_coordinates") and not meta:get("realcoordinates") then
+	if (
+		meta:contains("real_coordinates") and meta:get_int("real_coordinates")
+		or meta:get_int("realcoordinates") -- old screen
+	) == 0 then
 		fs = fs.."real_coordinates[false]"
 	end
 	local focus = meta:get("focus")