Quirk "quadruple amputee" now will return your original limbs back if you off it (#90745)

## About The Pull Request

Then you try to remove quirk - your limbs didn't change back to normal

**Visual bug only**, originally found on downstream. Also confirmed on
up-to-date TG-localhost


![error](https://github.com/user-attachments/assets/33c280d2-9aa9-4ccc-bca2-3977a2e723de)

## Why It's Good For The Game

Bug-Fix always good

## Changelog

🆑
fix: Quirk "quadruple amputee" now will return your original limbs back
if you off it
qol: Quirk "prosthetic limb" now resets more correctly
/🆑

---------

Co-authored-by: Maximal08 <73069825+Maximal08@users.noreply.github.com>
Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>

code/datums/quirks/negative_quirks/prosthetic_limb.dm

@@ -8,24 +8,26 @@
 	mail_goodies = list(/obj/item/weldingtool/mini, /obj/item/stack/cable_coil/five)
 	/// The slot to replace, in string form
 	var/slot_string = "limb"
-	/// the original limb from before the prosthetic was applied
-	var/obj/item/bodypart/old_limb
+	/// The slot to replace, in GLOB.limb_zones (both arms and both legs)
+	var/limb_zone
+	
 
 /datum/quirk_constant_data/prosthetic_limb
 	associated_typepath = /datum/quirk/prosthetic_limb
 	customization_options = list(/datum/preference/choiced/prosthetic)
 
 /datum/quirk/prosthetic_limb/add_unique(client/client_source)
-	var/limb_type = GLOB.prosthetic_limb_choice[client_source?.prefs?.read_preference(/datum/preference/choiced/prosthetic)]
+	var/obj/item/bodypart/limb_type = GLOB.prosthetic_limb_choice[client_source?.prefs?.read_preference(/datum/preference/choiced/prosthetic)]
 	if(isnull(limb_type))  //Client gone or they chose a random prosthetic
 		limb_type = GLOB.prosthetic_limb_choice[pick(GLOB.prosthetic_limb_choice)]
+	limb_zone = limb_type.body_zone
 
 	var/mob/living/carbon/human/human_holder = quirk_holder
 	var/obj/item/bodypart/surplus = new limb_type()
 	slot_string = "[surplus.plaintext_zone]"
 
 	medical_record_text = "Patient uses a low-budget prosthetic on the [slot_string]."
-	old_limb = human_holder.return_and_replace_bodypart(surplus, special = TRUE)
+	human_holder.del_and_replace_bodypart(surplus, special = TRUE)
 
 /datum/quirk/prosthetic_limb/post_add()
 	to_chat(quirk_holder, span_bolddanger("Your [slot_string] has been replaced with a surplus prosthetic. It has almost no muscle force, and makes you unhealthier by just having it. Additionally, \
@@ -33,5 +35,4 @@
 
 /datum/quirk/prosthetic_limb/remove()
 	var/mob/living/carbon/human/human_holder = quirk_holder
-	human_holder.del_and_replace_bodypart(old_limb, special = TRUE)
-	old_limb = null
+	human_holder.reset_to_original_bodypart(limb_zone)

code/datums/quirks/negative_quirks/quadruple_amputee.dm

@@ -18,3 +18,13 @@
 /datum/quirk/quadruple_amputee/post_add()
 	to_chat(quirk_holder, span_bolddanger("All your limbs have been replaced with surplus prosthetics. They are fragile and will easily come apart under duress. \
 	Additionally, you need to use a welding tool and cables to repair them, instead of bruise packs and ointment."))
+
+/datum/quirk/quadruple_amputee/remove()
+	if(QDELING(quirk_holder))
+		return
+	
+	var/mob/living/carbon/human/human_holder = quirk_holder
+	human_holder.reset_to_original_bodypart(BODY_ZONE_L_ARM)
+	human_holder.reset_to_original_bodypart(BODY_ZONE_R_ARM)
+	human_holder.reset_to_original_bodypart(BODY_ZONE_L_LEG)
+	human_holder.reset_to_original_bodypart(BODY_ZONE_R_LEG)

code/modules/surgery/bodyparts/helpers.dm

@@ -29,6 +29,24 @@
 	new_limb.try_attach_limb(src, special = special)
 	return old_limb // can be null
 
+/// Replaces the chosen limb(zone) to the original one
+/mob/living/carbon/proc/reset_to_original_bodypart(limb_zone)
+	if (!(limb_zone in GLOB.all_body_zones))
+		stack_trace("Invalid zone [limb_zone] provided to reset_to_original_bodypart()")
+		return
+
+	// find old limb to del it first
+	var/obj/item/bodypart/old_limb = get_bodypart(limb_zone)
+	if(old_limb)
+		old_limb.drop_limb(special = TRUE)
+		qdel(old_limb)
+
+	// mаke and attach the original limb
+	var/obj/item/bodypart/original_limb = newBodyPart(limb_zone)
+	original_limb.try_attach_limb(src, TRUE)
+	original_limb.update_limb(is_creating = TRUE)
+	regenerate_icons()
+
 /mob/living/carbon/has_hand_for_held_index(i)
 	if(!i)
 		return FALSE