Merge pull request #2621 from CHOMPStationBot/upstream-merge-11165

[MIRROR] Small light optimizations

code/datums/components/overlay_lighting.dm

@@ -182,9 +182,12 @@
 	if(!current_holder)
 		return
 	var/atom/movable/light_source = GET_LIGHT_SOURCE
+	. = list()
 	for(var/turf/lit_turf in view(lumcount_range, get_turf(light_source)))
 		lit_turf.dynamic_lumcount += lum_power
-		LAZYADD(affected_turfs, lit_turf)
+		. += lit_turf
+	if(length(.))
+		affected_turfs = .
 
 
 ///Clears the old affected turfs and populates the new ones.

code/game/turfs/turf_changing.dm

@@ -41,6 +41,7 @@
 	var/old_directional_opacity = directional_opacity
 	var/old_outdoors = outdoors
 	var/old_dangerous_objects = dangerous_objects
+	var/old_dynamic_lumcount = dynamic_lumcount
 
 	var/turf/Ab = GetAbove(src)
 	if(Ab)
@@ -111,6 +112,8 @@
 	lighting_corner_SW = old_lighting_corner_SW
 	lighting_corner_NW = old_lighting_corner_NW
 
+	dynamic_lumcount = old_dynamic_lumcount
+
 	if(SSlighting.subsystem_initialized)
 		lighting_object = old_lighting_object