Fix sulk sensors detecting vanished players (#5262)

Essentials/src/main/java/com/earth2me/essentials/EssentialsPlayerListener.java

@@ -121,6 +121,15 @@ public class EssentialsPlayerListener implements Listener, FakeAccessor {
         }
     }
 
+    private static boolean isGameEventEvent() {
+        try {
+            Class.forName("org.bukkit.event.block.BlockReceiveGameEvent");
+            return true;
+        } catch (final ClassNotFoundException ignored) {
+            return false;
+        }
+    }
+
     public void registerEvents() {
         ess.getServer().getPluginManager().registerEvents(this, ess);
 
@@ -128,6 +137,10 @@ public class EssentialsPlayerListener implements Listener, FakeAccessor {
             ess.getServer().getPluginManager().registerEvents(new ArrowPickupListener(), ess);
         }
 
+        if (isGameEventEvent()) {
+            ess.getServer().getPluginManager().registerEvents(new SculkListener1_17(), ess);
+        }
+
         if (isEntityPickupEvent()) {
             ess.getServer().getPluginManager().registerEvents(new PickupListener1_12(), ess);
         } else {
@@ -1001,6 +1014,15 @@ public class EssentialsPlayerListener implements Listener, FakeAccessor {
         }
     }
 
+    private final class SculkListener1_17 implements Listener {
+        @EventHandler
+        public void onGameEvent(final org.bukkit.event.block.BlockReceiveGameEvent event) {
+            if (event.getEntity() instanceof Player && ess.getUser((Player) event.getEntity()).isVanished()) {
+                event.setCancelled(true);
+            }
+        }
+    }
+
     private final class CommandSendFilter implements CommandSendListenerProvider.Filter {
         @Override
         public Predicate<String> apply(Player player) {