From d8dc04b6f30e2587ea3298941140f903ce0e7d19 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <Blake.Galbreath@GMail.com>
Date: Sun, 18 Jun 2017 18:17:05 -0500
Subject: [PATCH] Entity#fromMobSpawner()


diff --git a/src/main/java/net/minecraft/server/Entity.java b/src/main/java/net/minecraft/server/Entity.java
index 4dd2df808..433972025 100644
--- a/src/main/java/net/minecraft/server/Entity.java
+++ b/src/main/java/net/minecraft/server/Entity.java
@@ -184,6 +184,7 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
     public final boolean defaultActivationState;
     public long activatedTick = Integer.MIN_VALUE;
     public boolean fromMobSpawner;
+    public boolean spawnedViaMobSpawner; // Paper - Yes this name is similar to above, upstream took the better one
     protected int numCollisions = 0; // Paper
     public void inactiveTick() { }
     // Spigot end
@@ -1635,6 +1636,10 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
             if (this.origin != null) {
                 nbttagcompound.set("Paper.Origin", this.createList(origin.getX(), origin.getY(), origin.getZ()));
             }
+            // Save entity's from mob spawner status
+            if (spawnedViaMobSpawner) {
+                nbttagcompound.setBoolean("Paper.FromMobSpawner", true);
+            }
             // Paper end
             return nbttagcompound;
         } catch (Throwable throwable) {
@@ -1763,6 +1768,8 @@ public abstract class Entity implements INamableTileEntity, ICommandListener, Ke
             if (!originTag.isEmpty()) {
                 origin = new Location(world.getWorld(), originTag.getDoubleAt(0), originTag.getDoubleAt(1), originTag.getDoubleAt(2));
             }
+
+            spawnedViaMobSpawner = nbttagcompound.getBoolean("Paper.FromMobSpawner"); // Restore entity's from mob spawner status
             // Paper end
 
         } catch (Throwable throwable) {
diff --git a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
index 13e62e3d7..4bd511dd7 100644
--- a/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
+++ b/src/main/java/net/minecraft/server/MobSpawnerAbstract.java
@@ -133,6 +133,7 @@ public abstract class MobSpawnerAbstract {
                                 ((EntityInsentient) entity).prepare(world, world.getDamageScaler(new BlockPosition(entity)), EnumMobSpawn.SPAWNER, (GroupDataEntity) null, (NBTTagCompound) null);
                             }
                         }
+                        entity.spawnedViaMobSpawner = true; // Paper
                         // Spigot Start
                         if ( entity.world.spigotConfig.nerfSpawnerMobs )
                         {
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
index ed496d03a..b000bc8c7 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -1047,5 +1047,10 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
         Location origin = getHandle().origin;
         return origin == null ? null : origin.clone();
     }
+
+    @Override
+    public boolean fromMobSpawner() {
+        return getHandle().spawnedViaMobSpawner;
+    }
     // Paper end
 }
-- 
2.22.0