Drop Leads from nether portals - Fixes #3226

Spigot-Server-Patches/Fix-numerous-item-duplication-issues-and-teleport-is.patch

@@ -47,6 +47,15 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
          if (!this.world.isClientSide && !this.dead) {
              this.world.getMethodProfiler().enter("changeDimension");
              MinecraftServer minecraftserver = this.getMinecraftServer();
+@@ -0,0 +0,0 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
+                 entity.bukkitEntity = this.getBukkitEntity();
+ 
+                 if (this instanceof EntityInsentient) {
+-                    ((EntityInsentient)this).unleash(true, false); // Unleash to prevent duping of leads.
++                    ((EntityInsentient)this).unleash(true, true); // Paper drop lead
+                 }
+                 // CraftBukkit end
+             }
 @@ -0,0 +0,0 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
      }