Remove unnecessary contains before add and remove on HashSet

commons/src/main/java/net/jitse/npclib/api/NPC.java

@@ -132,9 +132,7 @@ public abstract class NPC implements PacketHandler, ActionHandler {
                 shown.add(player.getUniqueId());
             }
 
-            if (!autoHidden.contains(player.getUniqueId())) {
             autoHidden.add(player.getUniqueId());
-            }
             return;
         }
 
@@ -154,12 +152,10 @@ public abstract class NPC implements PacketHandler, ActionHandler {
             if (player.getLocation().distance(location) <= autoHideDistance) {
                 sendShowPackets(player);
             } else {
-                if (!autoHidden.contains(player.getUniqueId())) {
                 autoHidden.add(player.getUniqueId());
             }
         }
     }
-    }
 
     private boolean canSeeNPC(Player player) {
         Vector dir = location.toVector().subtract(player.getEyeLocation().toVector()).normalize();
@@ -189,10 +185,8 @@ public abstract class NPC implements PacketHandler, ActionHandler {
             if (player.getWorld().equals(location.getWorld()) && player.getLocation().distance(location) <= autoHideDistance) {
                 sendHidePackets(player, scheduler);
             } else {
-                if (autoHidden.contains(player.getUniqueId())) {
                 autoHidden.remove(player.getUniqueId());
             }
         }
     }
 }
-}

commons/src/main/java/net/jitse/npclib/listeners/PlayerListener.java

@@ -25,16 +25,12 @@ public class PlayerListener implements Listener {
     public void onPlayerQuit(PlayerQuitEvent event) {
         Player player = event.getPlayer();
         for (NPC npc : NPCManager.getAllNPCs()) {
-            if (npc.getAutoHidden().contains(player.getUniqueId())) {
             npc.getAutoHidden().remove(player.getUniqueId());
-            }
 
             // Don't need to use NPC#hide since the entity is not registered in the NMS server.
-            if (npc.getShown().contains(player.getUniqueId())) {
             npc.getShown().remove(player.getUniqueId());
         }
     }
-    }
 
     @EventHandler
     public void onPlayerChangedWorld(PlayerChangedWorldEvent event) {