Fix setCarryingChest not resizing horse inventory

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

paper-server/nms-patches/EntityHorseAbstract.patch

@@ -16,8 +16,12 @@
  
      public EntityHorseAbstract(World world) {
          super(world);
-@@ -214,7 +216,7 @@
-     protected void dx() {
+@@ -211,10 +213,10 @@
+         return 2;
+     }
+ 
+-    protected void dx() {
++    public void dx() { // PAIL: protected-> public, rename
          InventoryHorseChest inventoryhorsechest = this.inventoryChest;
  
 -        this.inventoryChest = new InventoryHorseChest("HorseChest", this.di());

paper-server/src/main/java/org/bukkit/craftbukkit/entity/CraftChestedHorse.java

@@ -22,6 +22,8 @@ public abstract class CraftChestedHorse extends CraftAbstractHorse implements Ch
 
     @Override
     public void setCarryingChest(boolean chest) {
+        if (chest == isCarryingChest()) return;
         getHandle().setCarryingChest(chest);
+        getHandle().dx();
     }
 }