Use VM transactions for conductor state changes.

VoxelManipulator-based transactions are used to hopefully speed up
scanning and replacing of networks of conductors when receptors start or
stop driving signals into them.

mesecons/init.lua

@@ -70,6 +70,8 @@ dofile(minetest.get_modpath("mesecons").."/internal.lua");
 -- these are the only functions you need to remember
 
 mesecon.queue:add_function("receptor_on", function (pos, rules)
+	mesecon.vm_begin()
+
 	rules = rules or mesecon.rules.default
 
 	-- if area (any of the rule targets) is not loaded, keep trying and call this again later
@@ -90,6 +92,8 @@ mesecon.queue:add_function("receptor_on", function (pos, rules)
 			mesecon.turnon(np, rulename)
 		end
 	end
+
+	mesecon.vm_commit()
 end)
 
 function mesecon.receptor_on(pos, rules)
@@ -97,6 +101,8 @@ function mesecon.receptor_on(pos, rules)
 end
 
 mesecon.queue:add_function("receptor_off", function (pos, rules)
+	mesecon.vm_begin()
+
 	rules = rules or mesecon.rules.default
 
 	-- if area (any of the rule targets) is not loaded, keep trying and call this again later
@@ -119,6 +125,8 @@ mesecon.queue:add_function("receptor_off", function (pos, rules)
 			end
 		end
 	end
+
+	mesecon.vm_commit()
 end)
 
 function mesecon.receptor_off(pos, rules)

mesecons/internal.lua

@@ -405,8 +405,7 @@ function mesecon.turnon(pos, link)
 			end
 
 			if success then
-				minetest.swap_node(f.pos, {name = mesecon.get_conductor_on(node, f.link),
-					param2 = node.param2})
+				mesecon.swap_node_force(f.pos, mesecon.get_conductor_on(node, f.link))
 
 				for npos, links in pairs(neighborlinks) do
 					-- links = all links to node, l = each single link
@@ -465,8 +464,7 @@ function mesecon.turnoff(pos, link)
 			end
 
 			if success then
-				minetest.swap_node(f.pos, {name = mesecon.get_conductor_off(node, f.link),
-					param2 = node.param2})
+				mesecon.swap_node_force(f.pos, mesecon.get_conductor_off(node, f.link))
 
 				for npos, links in pairs(neighborlinks) do
 					-- links = all links to node, l = each single link