#1011: Add Item Unlimited Lifetime APIs

By: Gero <gecam59@gmail.com>

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

@@ -41,13 +41,30 @@ public class CraftItem extends CraftEntity implements Item {
         item.pickupDelay = Math.min(delay, Short.MAX_VALUE);
     }
 
+    @Override
+    public void setUnlimitedLifetime(boolean unlimited) {
+        if (unlimited) {
+            // See EntityItem#INFINITE_LIFETIME
+            item.age = Short.MIN_VALUE;
+        } else {
+            item.age = getTicksLived();
+        }
+    }
+
+    @Override
+    public boolean isUnlimitedLifetime() {
+        return item.age == Short.MIN_VALUE;
+    }
+
     @Override
     public void setTicksLived(int value) {
         super.setTicksLived(value);
 
-        // Second field for EntityItem
+        // Second field for EntityItem (don't set if lifetime is unlimited)
+        if (!isUnlimitedLifetime()) {
             item.age = value;
         }
+    }
 
     @Override
     public void setOwner(UUID uuid) {