Merge pull request #11387 from Heroman3003/dupefix

Fixes infinite material duplication in R&D

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

@@ -302,6 +302,7 @@
 	if(uses_charge)
 		return null
 
+	tamount = round(tamount)
 	var/transfer = max(min(tamount, src.amount, initial(max_amount)), 0)
 
 	var/orig_amount = src.amount

code/modules/research/rdconsole_tgui.dm

@@ -423,6 +423,14 @@
 						to_chat(usr, "<span class='notice'>The destructive analyzer appears to be empty.</span>")
 						return
 
+					if(istype(linked_destroy.loaded_item,/obj/item/stack))//Only deconsturcts one sheet at a time instead of the entire stack
+						var/obj/item/stack/ST = linked_destroy.loaded_item
+						if(ST.get_amount() < 1)
+							playsound(linked_destroy, 'sound/machines/destructive_analyzer.ogg', 50, 1)
+							qdel(ST)
+							linked_destroy.icon_state = "d_analyzer"
+							return
+
 					for(var/T in linked_destroy.loaded_item.origin_tech)
 						files.UpdateTech(T, linked_destroy.loaded_item.origin_tech[T])
 					if(linked_lathe && linked_destroy.loaded_item.matter) // Also sends salvaged materials to a linked protolathe, if any.