hideunder: add gamestate check for hiding entities. (#1565)

runelite-client/src/main/java/net/runelite/client/plugins/hideunder/HideUnder.java

@@ -83,11 +83,11 @@ public class HideUnder extends Plugin
 		eventBus.subscribe(GameStateChanged.class, this, this::onGameStateChanged);
 	}
 
-	public void onGameStateChanged(GameStateChanged event)
+	private void onGameStateChanged(GameStateChanged event)
 	{
 		if (event.getGameState() == GameState.LOGGED_IN)
 		{
-			client.setIsHidingEntities(true);
+			client.setIsHidingEntities(isPlayerRegionAllowed());
 		}
 	}
 
@@ -207,4 +207,19 @@ public class HideUnder extends Plugin
 			}
 		}
 	}
+
+	private boolean isPlayerRegionAllowed()
+	{
+		final Player localPlayer = client.getLocalPlayer();
+
+		if (localPlayer == null)
+		{
+			return true;
+		}
+
+		final int playerRegionID = WorldPoint.fromLocalInstance(client, localPlayer.getLocalLocation()).getRegionID();
+
+		// 9520 = Castle Wars
+		return playerRegionID != 9520;
+	}
 }