fix(ui): fix main menu loading double borders if scenes switch back to main menu

src/main/java/de/hdm_stuttgart/battlearena/Controller/MainMenuController.java

@@ -9,11 +9,13 @@ import javafx.stage.Stage;
 public class MainMenuController extends SceneLoader {
     @FXML public BorderPane parent;
     @FXML public Button exitButton;
+    public static Pane center;
 
     public void playScene() {
+//        saving Borderpane without borders as regular pane so after switching scenes back to main menu it won't load the entire Borderpane, instead only the center content. Will fix the static and public identifier in the future
+        center = (Pane) parent.getCenter();
         Pane pane = new Pane(loadScene("Play"));
 //        get(0) returns the first item from the getChildren() List
-        parent.getChildren().clear();
         parent.setCenter(pane.getChildren().get(0));
     }
 

src/main/java/de/hdm_stuttgart/battlearena/Controller/PlayController.java

@@ -8,8 +8,9 @@ public class PlayController extends SceneLoader {
     @FXML public BorderPane parent;
 
     public void mainMenuScene() {
-        Pane pane = new Pane(loadScene("MainMenu"));
-        parent.setCenter(pane.getChildren().get(0));
+//        Pane pane = new Pane(loadScene("MainMenu"));
+//        parent.setCenter(pane.getChildren().get(0));
+        parent.setCenter(MainMenuController.center);
     }
 
     public void localScene() {