Fixed ItemHolderFinder bug, optimised NumericSlotType

Author: WillFP

Diff for: core/src/main/kotlin/com/willfp/libreforge/slot/ItemHolderFinder.kt

@@ -8,8 +8,12 @@ import com.willfp.libreforge.HolderProvider
 import com.willfp.libreforge.TypedHolderProvider
 import com.willfp.libreforge.TypedProvidedHolder
 import com.willfp.libreforge.get
+import com.willfp.libreforge.ifType
+import com.willfp.libreforge.isType
 import com.willfp.libreforge.registerRefreshFunction
+import com.willfp.libreforge.slot.impl.NumericSlotType
 import org.bukkit.entity.LivingEntity
+import org.bukkit.entity.Player
 import org.bukkit.inventory.ItemStack
 import java.util.UUID
 import java.util.concurrent.TimeUnit
@@ -37,10 +41,6 @@ abstract class ItemHolderFinder<T : Holder> {
      * Find holders on an [entity] for a given [slot].
      */
     fun findHolders(entity: LivingEntity, slot: SlotType): List<TypedProvidedHolder<T>> {
-        return doFindHolders(entity, slot)
-    }
-
-    private fun doFindHolders(entity: LivingEntity, slot: SlotType): List<TypedProvidedHolder<T>> {
         val items = slot.getItems(entity)
 
         val holders = items.map { item ->
@@ -74,8 +74,15 @@ abstract class ItemHolderFinder<T : Holder> {
             return cache.get(dispatcher.uuid) {
                 val entity = dispatcher.get<LivingEntity>() ?: return@get emptyList()
 
+                val slots = SlotTypes.baseTypes.toMutableSet()
+
+                // Prevents double scanning of held item slot
+                dispatcher.ifType<Player> {
+                    slots.remove(NumericSlotType(it.inventory.heldItemSlot))
+                }
+
                 // Only check for non-combined slot types
-                SlotTypes.baseTypes.flatMap { slot -> findHolders(entity, slot) }
+                slots.flatMap { slot -> findHolders(entity, slot) }
             }
         }
     }

Diff for: core/src/main/kotlin/com/willfp/libreforge/slot/impl/NumericSlotType.kt

@@ -10,6 +10,8 @@ import org.bukkit.inventory.ItemStack
 class NumericSlotType(
     private val slot: Int
 ) : SlotType(slot.toString()) {
+    private val slotList = slot.toSingletonList()
+
     override fun addToSlot(player: Player, item: ItemStack): Boolean {
         if (!player.inventory.getItem(slot).isEcoEmpty) {
             return false
@@ -28,6 +30,6 @@ class NumericSlotType(
     }
 
     override fun getItemSlots(player: Player): List<Int> {
-        return slot.toSingletonList()
+        return slotList
     }
 }