8236839: System menubar removed when other menubars are created or modified

Reviewed-by: kcr, aghaisas

Author: jkaving

modules/javafx.controls/src/main/java/javafx/scene/control/skin/MenuBarSkin.java

@@ -866,7 +866,8 @@ private void rebuildUI() {
                                         setSystemMenu(stage);
                                     }
                                 } else {
-                                    if (curMBSkin != null && curMBSkin.getSkinnable() != null &&
+                                    if (getSkinnable().isUseSystemMenuBar() &&
+                                            curMBSkin != null && curMBSkin.getSkinnable() != null &&
                                             curMBSkin.getSkinnable().isUseSystemMenuBar()) {
                                         curMBSkin.getSkinnable().setUseSystemMenuBar(false);
                                     }

modules/javafx.controls/src/test/java/test/javafx/scene/control/skin/MenuBarSkinTest.java

@@ -26,6 +26,7 @@
 package test.javafx.scene.control.skin;
 
 import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
 
 import com.sun.javafx.menu.MenuBase;
 import com.sun.javafx.stage.WindowHelper;
@@ -37,6 +38,7 @@
 import javafx.scene.Scene;
 import javafx.scene.control.Menu;
 import javafx.scene.control.MenuBar;
+import javafx.scene.control.MenuItem;
 import javafx.stage.Stage;
 
 import java.util.List;
@@ -163,6 +165,35 @@ public class MenuBarSkinTest {
         }
     }
 
+    @Test public void testModifyingNonSystemMenuBar() {
+        if (tk.getSystemMenu().isSupported()) {
+            // Set system menubar to true
+            menubar.setUseSystemMenuBar(true);
+
+            // Create a secondary menubar that is not
+            // a system menubar
+            MenuBar secondaryMenuBar = new MenuBar(
+                    new Menu("Menu 1", null, new MenuItem("Item 1")),
+                    new Menu("Menu 2", null, new MenuItem("Item 2")));
+            secondaryMenuBar.setSkin(new MenuBarSkin(secondaryMenuBar));
+
+            // Add the secondary menubar to the scene
+            ((Group)scene.getRoot()).getChildren().add(secondaryMenuBar);
+
+            // Verify that the menubar is the system menubar
+            assertTrue(menubar.isUseSystemMenuBar());
+
+            // Remove a menu from the secondary menubar
+            // to trigger a rebuild of its UI and a call
+            // to the sceneProperty listener
+            secondaryMenuBar.getMenus().remove(1);
+
+            // Verify that this has not affected whether the
+            // original menubar is the system menubar
+            assertTrue(menubar.isUseSystemMenuBar());
+        }
+    }
+
     public static final class MenuBarSkinMock extends MenuBarSkin {
         boolean propertyChanged = false;
         int propertyChangeCount = 0;