fix for the worlds shittiest exploit (#25130)

code/game/objects/structures/displaycase.dm

@@ -207,10 +207,12 @@
 		to_chat(user, "<span class='notice'>You start installing the electronics into [src]...</span>")
 		playsound(loc, I.usesound, 50, 1)
 		if(do_after(user, 30, target = src))
-			if(user.drop_item())
-				I.forceMove(src)
-				electronics = I
+			var/obj/item/airlock_electronics/new_electronics = I 
+			if(user.drop_item() && !new_electronics.is_installed)
+				new_electronics.forceMove(src)
+				electronics = new_electronics
 				to_chat(user, "<span class='notice'>You install the airlock electronics.</span>")
+				electronics.is_installed = TRUE
 
 	else if(istype(I, /obj/item/stack/sheet/glass))
 		var/obj/item/stack/sheet/glass/G = I
@@ -241,6 +243,7 @@
 		if(I.use_tool(src, user, 0, volume = I.tool_volume))
 			to_chat(user, "<span class='notice'>You remove the airlock electronics.</span>")
 			new /obj/item/airlock_electronics(drop_location(), 1)
+			electronics.is_installed = FALSE
 			electronics = null
 
 /obj/structure/displaycase_chassis/wrench_act(mob/user, obj/item/I)

code/game/objects/structures/door_assembly.dm

@@ -82,14 +82,16 @@
 		user.visible_message("[user] installs the electronics into the airlock assembly.", "You start to install electronics into the airlock assembly...")
 
 		if(do_after(user, 40 * W.toolspeed, target = src))
-			if(state != AIRLOCK_ASSEMBLY_NEEDS_ELECTRONICS)
+			var/obj/item/airlock_electronics/new_electronics = W
+			if(state != AIRLOCK_ASSEMBLY_NEEDS_ELECTRONICS || new_electronics.is_installed)
 				return
 			user.drop_item()
-			W.forceMove(src)
+			new_electronics.forceMove(src)
 			to_chat(user, "<span class='notice'>You install the airlock electronics.</span>")
 			state = AIRLOCK_ASSEMBLY_NEEDS_SCREWDRIVER
 			name = "near finished airlock assembly"
-			electronics = W
+			electronics = new_electronics
+			electronics.is_installed = TRUE
 
 	else if(istype(W, /obj/item/stack/sheet) && (!glass || !mineral))
 		var/obj/item/stack/sheet/S = W
@@ -137,6 +139,7 @@
 		ae = electronics
 		electronics = null
 		ae.forceMove(loc)
+		ae.is_installed = FALSE
 	update_appearance(UPDATE_NAME | UPDATE_OVERLAYS)
 
 /obj/structure/door_assembly/screwdriver_act(mob/user, obj/item/I)

code/game/objects/structures/windoor_assembly.dm

@@ -155,16 +155,18 @@
 				user.visible_message("[user] installs the electronics into the windoor assembly.", "You start to install electronics into the windoor assembly...")
 				user.drop_item()
 				W.forceMove(src)
+				var/obj/item/airlock_electronics/new_electronics = W
 
-				if(do_after(user, 40 * W.toolspeed, target = src))
+				if(do_after(user, 40 * new_electronics.toolspeed, target = src) && !new_electronics.is_installed)
 					if(!src || electronics)
-						W.forceMove(loc)
+						new_electronics.forceMove(loc)
 						return
 					to_chat(user, "<span class='notice'>You install the windoor electronics.</span>")
 					name = "near finished windoor assembly"
-					electronics = W
+					electronics = new_electronics
+					electronics.is_installed = TRUE
 				else
-					W.forceMove(loc)
+					new_electronics.forceMove(loc)
 
 			else if(is_pen(W))
 				var/t = rename_interactive(user, W)
@@ -247,6 +249,7 @@
 	ae = electronics
 	electronics = null
 	ae.forceMove(loc)
+	ae.is_installed = FALSE
 
 /obj/structure/windoor_assembly/wirecutter_act(mob/user, obj/item/I)
 	if(state != WIRED_ASSEMBLY)