Preserve inventory of mobs who turn into toilets (#94666)

## About The Pull Request

This PR changes it so that if you commit suicide via handheld experiment
scanner, all of your belongings are placed inside the resulting toilet's
cistern rather than just your brain.

## Why It's Good For The Game

It was pointed out that most forms of suicide that "destroy" the body
preserve the items, while this one does not.
This is largely a measure for ensuring that various items required for
traitor objectives or other reasons are not destroyed.

## Changelog

🆑
fix: Meat toilets will now contain all of the belongings they were
wearing prior to transformation, which can be retrieved if the cistern
is open and the lid is closed.
/🆑

code/game/objects/structures/water_structures/toilet.dm

@@ -101,6 +101,9 @@
 	. = ..()
 	if(gone in cistern_items)
 		LAZYREMOVE(cistern_items, gone)
+		if (isitem(gone))
+			var/obj/item/removed_item = gone
+			w_items -= removed_item.w_class
 		return
 	if(gone in fishes)
 		LAZYREMOVE(fishes, gone)
@@ -172,7 +175,6 @@
 		else
 			random_cistern_item.forceMove(drop_location())
 		to_chat(user, span_notice("You find [random_cistern_item] in the cistern."))
-		w_items -= random_cistern_item.w_class
 		return
 
 	if(!flushing && LAZYLEN(fishes) && cover_open)
@@ -245,7 +247,7 @@
 
 	add_fingerprint(user)
 	if(cover_open && istype(tool, /obj/item/fish))
-		if(fishes >= 3)
+		if(LAZYLEN(fishes) >= 3)
 			to_chat(user, span_warning("There's too many fishes, flush them down first."))
 			return ITEM_INTERACT_BLOCKING
 		if(!user.transferItemToLoc(tool, src))
@@ -280,8 +282,7 @@
 		if(!user.transferItemToLoc(tool, src))
 			to_chat(user, span_warning("\The [tool] is stuck to your hand, you cannot put it in the cistern!"))
 			return ITEM_INTERACT_BLOCKING
-		LAZYADD(cistern_items, tool)
-		w_items += tool.w_class
+		add_cistern_item(tool)
 		to_chat(user, span_notice("You carefully place [tool] into the cistern."))
 		return ITEM_INTERACT_SUCCESS
 
@@ -326,6 +327,12 @@
 	to_chat(user, span_notice("You fill [container] from [src]. Gross."))
 	return ITEM_INTERACT_SUCCESS
 
+/// Hides an item inside the toilet for later retrievalk
+/obj/structure/toilet/proc/add_cistern_item(obj/item/thing)
+	if (isitem(thing))
+		w_items += thing.w_class
+	LAZYADD(cistern_items, thing)
+
 /obj/structure/toilet/crowbar_act(mob/living/user, obj/item/tool)
 	to_chat(user, span_notice("You start to [cistern_open ? "replace the lid on" : "lift the lid off"] the cistern..."))
 	playsound(loc, 'sound/effects/stonedoor_openclose.ogg', 50, TRUE)
@@ -397,11 +404,11 @@
 
 /obj/structure/toilet/secret/Initialize(mapload)
 	. = ..()
-	if(secret_type)
-		var/obj/item/secret = new secret_type(src)
-		secret.desc += " It's a secret!"
-		w_items += secret.w_class
-		LAZYADD(cistern_items, secret)
+	if(!secret_type)
+		return
+	var/obj/item/secret = new secret_type(src)
+	secret.desc += " It's a secret!"
+	add_cistern_item(secret)
 
 ///A toilet made of meat that only drops remains when deconstructed, often unleashed unto this cursed plane of existence by hopeless people off'ing themselves with experi-scanners.
 /obj/structure/toilet/greyscale/flesh
@@ -414,6 +421,9 @@
 	var/obj/item/organ/brain/toilet_brain
 	if(suicide)
 		toilet_brain = suicide.get_organ_slot(ORGAN_SLOT_BRAIN)
+		for(var/obj/item/thing in suicide)
+			if (suicide.transferItemToLoc(thing, newloc = src, silent = TRUE))
+				add_cistern_item(thing)
 		suicide.gib(DROP_BRAIN) //we delete everything but the brain, as it's going to be moved to the cistern
 		set_custom_materials(list(GET_MATERIAL_REF(/datum/material/meat/mob_meat, suicide) = SHEET_MATERIAL_AMOUNT))
 	else
@@ -421,7 +431,7 @@
 		set_custom_materials(list(/datum/material/meat = SHEET_MATERIAL_AMOUNT))
 
 	toilet_brain.forceMove(src)
-	w_items += toilet_brain.w_class
+	add_cistern_item(toilet_brain)
 
 //this also prevents the toilet from dropping meat sheets. if you want to cheese the meat exepriments, sacrifice more people
 /obj/structure/toilet/greyscale/flesh/atom_deconstruct(dissambled = TRUE)