Lighting minor tweak (#17560)

* Atomization

* sfdsaf

---------

Co-authored-by: FluffyGhost <FluffyGhost>

code/modules/lighting/lighting_overlay.dm

@@ -17,7 +17,8 @@
 	transform = matrix(WORLD_ICON_SIZE / 32, 0, (WORLD_ICON_SIZE - 32) / 2, 0, WORLD_ICON_SIZE / 32, (WORLD_ICON_SIZE - 32) / 2)
 	#endif
 
-/atom/movable/lighting_overlay/New()
+/atom/movable/lighting_overlay/Initialize(mapload, ...)
+	. = ..()
 	SSlighting.total_lighting_overlays++
 
 	var/turf/T         = loc // If this runtimes atleast we'll know what's creating overlays in things that aren't turfs.

code/modules/lighting/lighting_source.dm

@@ -404,9 +404,10 @@
 
 	var/list/L = turfs - affecting_turfs // New turfs, add us to the affecting lights of them.
 	affecting_turfs += L
-	for (thing in L)
-		T = thing
-		LAZYADD(T.affecting_lights, src)
+	for (var/turf/affected_turf as anything in L)
+		if(!QDELETED(affected_turf))
+			T = affected_turf
+			LAZYADD(T.affecting_lights, src)
 
 	L = affecting_turfs - turfs // Now-gone turfs, remove us from the affecting lights.
 	affecting_turfs -= L

html/changelogs/FluffyGhost-lighting_minor_tweak.yml

@@ -0,0 +1,42 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes:
+#   bugfix
+#   wip (For works in progress)
+#   tweak
+#   soundadd
+#   sounddel
+#   rscadd (general adding of nice things)
+#   rscdel (general deleting of nice things)
+#   imageadd
+#   imagedel
+#   maptweak
+#   spellcheck (typo fixes)
+#   experiment
+#   balance
+#   admin
+#   backend
+#   security
+#   refactor
+#################################
+
+# Your name.
+author: FluffyGhost
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, all entries are changed into a single [] after a master changelog generation. Just remove the brackets when you add new entries.
+# Please surround your changes in  double quotes ("), as certain characters otherwise screws up compiling. The quotes will not show up in the changelog.
+changes:
+  - backend: "Lighting overlays are now initialized in Initialize instead of New."
+  - backend: "Corner updating for lighting now checks that the turfs are not being deleted when adding lights to the affected lights of them."