Comment about where merging is handled, moved to_transfer variable to immediately above where it is used

code/game/objects/items/stacks/stack.dm

@@ -13,7 +13,6 @@
 	var/list/recipes = list() // /datum/stack_recipe
 	var/singular_name
 	var/amount = 1
-	var/to_transfer = 0
 	var/max_amount //also see stack recipes initialisation, param "max_res_amount" must be equal to this max_amount
 	var/merge_type = null // This path and its children should merge with this stack, defaults to src.type
 
@@ -232,6 +231,7 @@
 /obj/item/stack/proc/get_max_amount()
 	return max_amount
 
+var/to_transfer = 0
 /obj/item/stack/proc/get_amount_transferred()
 	return to_transfer
 

code/modules/power/cable.dm

@@ -588,6 +588,7 @@ var/global/list/datum/stack_recipe/cable_coil_recipes = list(
 	..()
 	if(istype(W, /obj/item/stack/cable_coil))
 		var/obj/item/stack/cable_coil/C = W
+		// Cable merging is handled by parent proc
 		if(C.amount >= MAXCOIL)
 			to_chat(user, "The coil is as long as it will get.")
 			return