Backport to 1.8.8 too

v1_13_R2/src/main/java/net/citizensnpcs/nms/v1_13_R2/util/PlayerlistTrackerEntry.java

@@ -31,7 +31,7 @@ public class PlayerlistTrackerEntry extends EntityTrackerEntry {
     public void updateLastPlayer() {
         if (lastUpdatedPlayer == null)
             return;
-        Entity tracker = getTracker(this);
+        final Entity tracker = getTracker(this);
         final EntityPlayer entityplayer = lastUpdatedPlayer;
         NMS.sendTabListAdd(entityplayer.getBukkitEntity(), (Player) tracker.getBukkitEntity());
         lastUpdatedPlayer = null;

v1_8_R3/src/main/java/net/citizensnpcs/nms/v1_8_R3/entity/EntityHumanNPC.java

@@ -30,6 +30,7 @@ import net.citizensnpcs.nms.v1_8_R3.util.PlayerControllerJump;
 import net.citizensnpcs.nms.v1_8_R3.util.PlayerControllerLook;
 import net.citizensnpcs.nms.v1_8_R3.util.PlayerControllerMove;
 import net.citizensnpcs.nms.v1_8_R3.util.PlayerNavigation;
+import net.citizensnpcs.nms.v1_8_R3.util.PlayerlistTrackerEntry;
 import net.citizensnpcs.npc.CitizensNPC;
 import net.citizensnpcs.npc.ai.NPCHolder;
 import net.citizensnpcs.npc.skin.SkinPacketTracker;
@@ -42,6 +43,7 @@ import net.minecraft.server.v1_8_R3.AttributeInstance;
 import net.minecraft.server.v1_8_R3.Block;
 import net.minecraft.server.v1_8_R3.BlockPosition;
 import net.minecraft.server.v1_8_R3.DamageSource;
+import net.minecraft.server.v1_8_R3.DataWatcher;
 import net.minecraft.server.v1_8_R3.Entity;
 import net.minecraft.server.v1_8_R3.EntityPlayer;
 import net.minecraft.server.v1_8_R3.EnumProtocolDirection;
@@ -59,12 +61,12 @@ public class EntityHumanNPC extends EntityPlayer implements NPCHolder, Skinnable
     private PlayerControllerJump controllerJump;
     private PlayerControllerLook controllerLook;
     private PlayerControllerMove controllerMove;
-    private boolean isTracked = false;
     private int jumpTicks = 0;
     private PlayerNavigation navigation;
     private final CitizensNPC npc;
     private final Location packetLocationCache = new Location(null, 0, 0, 0);
     private final SkinPacketTracker skinTracker;
+    private PlayerlistTrackerEntry trackerEntry;
     private int updateCounter = 0;
 
     public EntityHumanNPC(MinecraftServer minecraftServer, WorldServer world, GameProfile gameProfile,
@@ -90,7 +92,7 @@ public class EntityHumanNPC extends EntityPlayer implements NPCHolder, Skinnable
 
     @Override
     public boolean a(EntityPlayer entityplayer) {
-        if (npc != null && !isTracked) {
+        if (npc != null && trackerEntry == null) {
             return false;
         }
         return super.a(entityplayer);
@@ -211,6 +213,14 @@ public class EntityHumanNPC extends EntityPlayer implements NPCHolder, Skinnable
         return controllerMove;
     }
 
+    @Override
+    public DataWatcher getDataWatcher() {
+        if (trackerEntry != null && trackerEntry.isUpdating()) {
+            trackerEntry.updateLastPlayer();
+        }
+        return super.getDataWatcher();
+    }
+
     public NavigationAbstract getNavigation() {
         return navigation;
     }
@@ -352,8 +362,8 @@ public class EntityHumanNPC extends EntityPlayer implements NPCHolder, Skinnable
         controllerLook.a(target.getX(), target.getY(), target.getZ(), 10, 40);
     }
 
-    public void setTracked() {
+    public void setTracked(PlayerlistTrackerEntry trackerEntry) {
-        isTracked = true;
+        this.trackerEntry = trackerEntry;
     }
 
     @Override

v1_8_R3/src/main/java/net/citizensnpcs/nms/v1_8_R3/util/NMSImpl.java

@@ -772,7 +772,7 @@ public class NMSImpl implements NMSBridge {
             }
         }
         if (getHandle(player) instanceof EntityHumanNPC) {
-            ((EntityHumanNPC) getHandle(player)).setTracked();
+            ((EntityHumanNPC) getHandle(player)).setTracked(replace);
         }
     }
 

v1_8_R3/src/main/java/net/citizensnpcs/nms/v1_8_R3/util/PlayerlistTrackerEntry.java

@@ -2,16 +2,20 @@ package net.citizensnpcs.nms.v1_8_R3.util;
 
 import java.lang.reflect.Field;
 
+import org.bukkit.Bukkit;
 import org.bukkit.entity.Player;
 
+import net.citizensnpcs.Settings.Setting;
+import net.citizensnpcs.api.CitizensAPI;
 import net.citizensnpcs.nms.v1_8_R3.entity.EntityHumanNPC;
-import net.citizensnpcs.npc.skin.SkinnableEntity;
 import net.citizensnpcs.util.NMS;
 import net.minecraft.server.v1_8_R3.Entity;
 import net.minecraft.server.v1_8_R3.EntityPlayer;
 import net.minecraft.server.v1_8_R3.EntityTrackerEntry;
 
 public class PlayerlistTrackerEntry extends EntityTrackerEntry {
+    private EntityPlayer lastUpdatedPlayer;
+
     public PlayerlistTrackerEntry(Entity entity, int i, int j, boolean flag) {
         super(entity, i, j, flag);
     }
@@ -20,28 +24,35 @@ public class PlayerlistTrackerEntry extends EntityTrackerEntry {
         this(getTracker(entry), getB(entry), getC(entry), getU(entry));
     }
 
+    public boolean isUpdating() {
+        return lastUpdatedPlayer != null;
+    }
+
+    public void updateLastPlayer() {
+        if (lastUpdatedPlayer == null)
+            return;
+        final Entity tracker = getTracker(this);
+        final EntityPlayer entityplayer = lastUpdatedPlayer;
+        NMS.sendTabListAdd(entityplayer.getBukkitEntity(), (Player) tracker.getBukkitEntity());
+        lastUpdatedPlayer = null;
+        if (!Setting.DISABLE_TABLIST.asBoolean())
+            return;
+        Bukkit.getScheduler().scheduleSyncDelayedTask(CitizensAPI.getPlugin(), new Runnable() {
+            @Override
+            public void run() {
+                NMS.sendTabListRemove(entityplayer.getBukkitEntity(), (Player) tracker.getBukkitEntity());
+            }
+        });
+    }
+
     @Override
     public void updatePlayer(final EntityPlayer entityplayer) {
         // prevent updates to NPC "viewers"
         if (entityplayer instanceof EntityHumanNPC)
             return;
-        Entity tracker = getTracker(this);
+        lastUpdatedPlayer = entityplayer;
-        if (entityplayer != tracker && c(entityplayer)) {
-            if (!this.trackedPlayers.contains(entityplayer)
-                    && ((entityplayer.u().getPlayerChunkMap().a(entityplayer, tracker.ae, tracker.ag))
-                            || (tracker.attachedToPlayer))) {
-                if ((tracker instanceof SkinnableEntity)) {
-                    SkinnableEntity skinnable = (SkinnableEntity) tracker;
-
-                    Player player = skinnable.getBukkitEntity();
-                    if (!entityplayer.getBukkitEntity().canSee(player))
-                        return;
-
-                    skinnable.getSkinTracker().updateViewer(entityplayer.getBukkitEntity());
-                }
-            }
-        }
         super.updatePlayer(entityplayer);
+        lastUpdatedPlayer = null;
     }
 
     private static int getB(EntityTrackerEntry entry) {