SPIGOT-2913: Only one enchantment applied to items

By: md_5 <git@md-5.net>

paper-server/nms-patches/ContainerEnchantTable.patch

@@ -106,26 +106,13 @@
                      this.b();
                  }
              } else {
-@@ -174,27 +236,59 @@
+@@ -177,24 +239,49 @@
-             return false;
+                 List list = this.a(itemstack, i, this.costs[i]);
-         } else if (this.costs[i] > 0 && !itemstack.isEmpty() && (entityhuman.expLevel >= j && entityhuman.expLevel >= this.costs[i] || entityhuman.abilities.canInstantlyBuild)) {
-             if (!this.world.isClientSide) {
--                List list = this.a(itemstack, i, this.costs[i]);
-+                // CraftBukkit start - Use the data generated by the PostPrepareItemEnchantEvent
-+                List list;
-+                if (this.h[i] < 0) {
-+                    list = this.a(itemstack, i, this.costs[i]);
-+                } else {
-+                    list = Collections.singletonList(new WeightedRandomEnchant(Enchantment.c(this.h[i]), this.i[i]));
-+                }
-+                // CraftBukkit end
-+                boolean flag = itemstack.getItem() == Items.BOOK;
  
--                if (!list.isEmpty()) {
+                 if (!list.isEmpty()) {
 -                    entityhuman.enchantDone(j);
--                    boolean flag = itemstack.getItem() == Items.BOOK;
-+                if (list != null) {
 +                    // CraftBukkit start
+                     boolean flag = itemstack.getItem() == Items.BOOK;
 +                    Map<org.bukkit.enchantments.Enchantment, Integer> enchants = new java.util.HashMap<org.bukkit.enchantments.Enchantment, Integer>();
 +                    for (Object obj : list) {
 +                        WeightedRandomEnchant instance = (WeightedRandomEnchant) obj;
@@ -176,7 +163,7 @@
                      if (!entityhuman.abilities.canInstantlyBuild) {
                          itemstack1.subtract(j);
                          if (itemstack1.isEmpty()) {
-@@ -229,6 +323,11 @@
+@@ -229,6 +316,11 @@
  
      public void b(EntityHuman entityhuman) {
          super.b(entityhuman);
@@ -188,7 +175,7 @@
          if (!this.world.isClientSide) {
              for (int i = 0; i < this.enchantSlots.getSize(); ++i) {
                  ItemStack itemstack = this.enchantSlots.splitWithoutUpdate(i);
-@@ -242,6 +341,7 @@
+@@ -242,6 +334,7 @@
      }
  
      public boolean a(EntityHuman entityhuman) {
@@ -196,7 +183,7 @@
          return this.world.getType(this.position).getBlock() != Blocks.ENCHANTING_TABLE ? false : entityhuman.d((double) this.position.getX() + 0.5D, (double) this.position.getY() + 0.5D, (double) this.position.getZ() + 0.5D) <= 64.0D;
      }
  
-@@ -294,4 +394,17 @@
+@@ -294,4 +387,17 @@
  
          return itemstack;
      }