SPIGOT-2864: Make Arrow / Item setTicksLived behave like FallingBlock

nms-patches/EntityArrow.patch

@@ -14,6 +14,15 @@
  public abstract class EntityArrow extends Entity implements IProjectile {
  
      private static final Predicate<Entity> g = IEntitySelector.f.and(IEntitySelector.a.and(Entity::isInteractable));
+@@ -22,7 +29,7 @@
+     public EntityArrow.PickupStatus fromPlayer;
+     public int shake;
+     public UUID shooter;
+-    private int despawnCounter;
++    public int despawnCounter; // PAIL
+     private int aB;
+     private double damage;
+     public int knockbackStrength;
 @@ -250,6 +257,7 @@
      }
  

nms-patches/EntityItem.patch

@@ -1,6 +1,6 @@
 --- a/net/minecraft/server/EntityItem.java
 +++ b/net/minecraft/server/EntityItem.java
-@@ -3,6 +3,10 @@
+@@ -3,16 +3,21 @@
  import java.util.Iterator;
  import java.util.UUID;
  import javax.annotation.Nullable;
@@ -11,7 +11,11 @@
  
  public class EntityItem extends Entity {
  
-@@ -13,6 +17,7 @@
+     private static final DataWatcherObject<ItemStack> b = DataWatcher.a(EntityItem.class, DataWatcherRegistry.g);
+-    private int age;
++    public int age; // PAIL
+     public int pickupDelay;
+     private int e;
      private UUID f;
      private UUID g;
      public float a;

src/main/java/org/bukkit/craftbukkit/entity/CraftArrow.java

@@ -84,6 +84,14 @@ public class CraftArrow extends AbstractProjectile implements Arrow {
         getHandle().fromPlayer = EntityArrow.PickupStatus.a(status.ordinal());
     }
 
+    @Override
+    public void setTicksLived(int value) {
+        super.setTicksLived(value);
+
+        // Second field for EntityArrow
+        getHandle().despawnCounter = value;
+    }
+
     @Override
     public EntityArrow getHandle() {
         return (EntityArrow) entity;

src/main/java/org/bukkit/craftbukkit/entity/CraftItem.java

@@ -37,6 +37,14 @@ public class CraftItem extends CraftEntity implements Item {
         item.pickupDelay = Math.min(delay, Short.MAX_VALUE);
     }
 
+    @Override
+    public void setTicksLived(int value) {
+        super.setTicksLived(value);
+
+        // Second field for EntityItem
+        item.age = value;
+    }
+
     @Override
     public String toString() {
         return "CraftItem";