Don't touch filtered slots with non-stackable items in it

src/main/kotlin/ru/dbotthepony/mc/otm/container/ContainerHelpers.kt

@@ -295,31 +295,7 @@ operator fun CraftingContainer.get(column: Int, row: Int, flop: Boolean): ItemSt
 }
 
 fun Container.sort(comparator: Comparator<ItemStack> = ItemStackSorter.DEFAULT) {
-	if (isEmpty)
+	sortWithIndices(computeSortedIndices(comparator))
-		return
-
-	val slots = slotIterator().filter { !it.isForbiddenForAutomation && it.getMaxStackSize() >= it.item.count }.toList()
-
-	if (slots.isEmpty())
-		return
-
-	val items = Object2ObjectOpenCustomHashMap<ItemStack, ItemStack>(ItemStackHashStrategy)
-
-	slots.forEach {
-		val get = items[it.item]
-
-		if (get == null) {
-			items[it.item] = it.item.copy()
-		} else {
-			get.count += it.item.count
-		}
-	}
-
-	val sortedItems = ObjectArrayList(items.values)
-	sortedItems.sortWith(comparator)
-
-	slots.forEach { it.remove() }
-	sortedItems.forEach { addItem(it, false) }
 }
 
 fun Container.sortWithIndices(sortedSlots: IntCollection) {
@@ -337,7 +313,12 @@ fun Container.sortWithIndices(sortedSlots: IntCollection) {
 		if (value in 0 until containerSize && seen.add(value)) {
 			val slot = containerSlot(value)
 
-			if (slot.isNotEmpty && !slot.isForbiddenForAutomation && slot.item.count <= slot.getMaxStackSize()) {
+			if (
+				slot.isNotEmpty &&
+				!slot.isForbiddenForAutomation &&
+				slot.item.count <= slot.getMaxStackSize() &&
+				(!slot.hasFilter || slot.getFilter() != slot.item.item || slot.getMaxStackSize() > 1)
+			) {
 				valid.add(slot)
 			}
 		}