Fixes Three Mapping Bugs (#14298)

code/modules/shieldgen/shield_diffuser.dm

@@ -1,3 +1,7 @@
+//
+// Shield Diffusers
+//
+
 /obj/machinery/shield_diffuser
 	name = "shield diffuser"
 	desc = "A small underfloor device specifically designed to disrupt energy barriers."
@@ -10,20 +14,21 @@
 	density = FALSE
 	level = 1
 
-	var/enabled = TRUE
+	var/diffuser_enabled = TRUE
+	var/diffuser_range = 0 // 1x1 tiles, including the tile its on.
 
 /obj/machinery/shield_diffuser/process()
 	if(stat & BROKEN)
 		return PROCESS_KILL
 
-	if(!enabled || stat & NOPOWER)
+	if(!diffuser_enabled || stat & NOPOWER)
 		return
 
-	for(var/obj/effect/energy_field/S in range(1, src))
+	for(var/obj/effect/energy_field/S in range(diffuser_range, src))
 		S.diffuse(5)
 
 /obj/machinery/shield_diffuser/update_icon()
-	if(stat & NOPOWER || stat & BROKEN || !enabled)
+	if(stat & NOPOWER || stat & BROKEN || !diffuser_enabled)
 		icon_state = "fdiffuser_off"
 	else
 		icon_state = "fdiffuser_on"
@@ -39,15 +44,23 @@
 	interact(user)
 
 /obj/machinery/shield_diffuser/interact(mob/user)
-	enabled = !enabled
+	diffuser_enabled = !diffuser_enabled
 
 	update_icon()
-	to_chat(user, "You turn \the [src] [enabled ? "on" : "off"].")
+	to_chat(user, "You turn \the [src] [diffuser_enabled ? "on" : "off"].")
 
 /obj/machinery/shield_diffuser/examine(mob/user)
 	. = ..()
-	to_chat(user, "It is [enabled ? "enabled" : "disabled"].")
+	to_chat(user, "It is [diffuser_enabled ? "diffuser_enabled" : "disabled"].")
 
 /obj/machinery/shield_diffuser/power_change()
 	..()
 	update_icon()
+
+//
+// Shield Diffuser Variants
+//
+
+// 3x3 Range Shield Diffuser
+/obj/machinery/shield_diffuser/threebythree
+	diffuser_range = 1 // 3x3 tiles, including the tile its on.