`mesecon:updatenode()` was written to work only with conductors, though in...

`mesecon:updatenode()` was written to work only with conductors, though in several places it was used on recepters and effectors. This issue, reported by simion314, is fixed in this commit by explicitly checking for the type of mesecon node being updated.

mesecons/internal.lua

@@ -236,7 +236,7 @@ end
 
 function mesecon:connected_to_pw_src(pos, checked)
 	local c = 1
-	if checked == nil then checked = {} end
+	checked = checked or {}
 	while checked[c] ~= nil do --find out if node has already been checked (to prevent from endless loop)
 		if  compare_pos(checked[c], pos) then
 			return false, checked
@@ -246,16 +246,26 @@ function mesecon:connected_to_pw_src(pos, checked)
 	checked[c] = {x=pos.x, y=pos.y, z=pos.z} --add current node to checked
 
 	local node = minetest.env:get_node_or_nil(pos)
-	if node == nil then return false, checked end
-	if not mesecon:is_conductor(node.name) then return false, checked end
 
+	if node == nil then return false, checked end
+	if mesecon:is_receptor_node(node.name) then
+		return true, checked
+	end
+	if mesecon:is_receptor_node_off(node.name) then
+		return true, checked
+	end
 	if mesecon:is_powered_by_receptor(pos) then --return if conductor is powered
 		return true, checked
 	end
 
 	--Check if conductors around are connected
-	local connected
-	local rules = mesecon:conductor_get_rules(node)
+	if mesecon:is_conductor(node.name) then
+		rules = mesecon:conductor_get_rules(node)
+	elseif mesecon:is_effector(node.name) then
+		rules = mesecon:effector_get_input_rules(node)
+	else
+		return false, checked
+	end
 
 	for i, rule in ipairs(rules) do
 		local np = {}