8178430: JMenu in GridBagLayout flickers when label text shows "..." and is updated

Reviewed-by: serb, ssadetsky

src/java.desktop/share/classes/javax/swing/plaf/basic/BasicMenuUI.java

@@ -226,8 +226,13 @@ public class BasicMenuUI extends BasicMenuItemUI
         return (MenuKeyListener)getHandler();
     }
 
+    public Dimension getMinimumSize(JComponent c) {
+        return (((JMenu)menuItem).isTopLevelMenu()) ?
+            c.getPreferredSize() : null;
+    }
+
     public Dimension getMaximumSize(JComponent c) {
-        if (((JMenu)menuItem).isTopLevelMenu() == true) {
+        if (((JMenu)menuItem).isTopLevelMenu()) {
             Dimension d = c.getPreferredSize();
             return new Dimension(d.width, Short.MAX_VALUE);
         }

test/jdk/javax/swing/JMenu/8178430/LabelDotTest.java

@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2009, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+/*
+ * @test
+ * @bug 8178430
+ * @summary JMenu in GridBagLayout flickers when label text shows "..." and
+ * is updated
+ * @run main LabelDotTest
+ */
+import java.awt.Dimension;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.Robot;
+
+import java.util.stream.IntStream;
+
+import javax.swing.SwingUtilities;
+import javax.swing.JLabel;
+import javax.swing.JMenu;
+import javax.swing.JFrame;
+import javax.swing.JMenuBar;
+import javax.swing.JPanel;
+import javax.swing.SwingConstants;
+
+public class LabelDotTest
+{
+    private final static String longText = "show a very long text to have it " +
+            "automatically shortened";
+    private final static String shortText = "show short text";
+
+    private static JFrame frame;
+    private static JLabel label;
+    private static JMenu menu;
+    private static volatile boolean isException = false;
+
+    private static void createUI() {
+       System.out.println("BEFORE CREATION");
+       frame = new JFrame();
+       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+       frame.setSize(new Dimension(50, 150));
+       frame.setLocationRelativeTo(null);
+
+       frame.setLayout(new GridBagLayout());
+       GridBagConstraints c = new GridBagConstraints();
+       c.fill = GridBagConstraints.BOTH;
+       c.weightx = 1.0;
+       c.weighty = 0.0;
+       c.gridwidth = GridBagConstraints.REMAINDER;
+
+       JMenuBar menuBar = new JMenuBar();
+       menu = new JMenu("Menu");
+       menuBar.add(menu);
+       frame.add(menuBar, c);
+
+       frame.add(new JLabel("Title", SwingConstants.CENTER), c);
+
+       c.weighty = 1.0;
+       frame.add(new JPanel(new GridBagLayout()), c);
+       c.weighty = 0.0;
+
+       label = new JLabel(shortText);
+       frame.add(label, c);
+
+       frame.setVisible(true);
+   }
+
+   private static void runTest(int iterations) throws Exception{
+        Robot robot = new Robot();
+
+        IntStream.range(0, iterations).forEach((i) -> {
+                SwingUtilities.invokeLater(() -> {
+                    if (label.getText().equals(shortText)) {
+                        label.setText(longText);
+                    } else {
+                        label.setText(shortText);
+                    }
+                    /*  For a top level menu item, minimum size and the
+                        preferred size should be the same, and should not be
+                        equal to 1. Save the exception state and throw later
+                        once the iterations are completed.
+                    */
+                    isException = (menu.getMinimumSize().height == 1 &&
+                        !menu.getMinimumSize().equals(menu.getPreferredSize())) ||
+                        isException;
+                });
+                robot.waitForIdle();
+        });
+   }
+
+   public static void main(String[] args) throws Exception {
+        try {
+            SwingUtilities.invokeAndWait(() -> createUI());
+            runTest(50);
+        } finally {
+            SwingUtilities.invokeAndWait(() -> frame.dispose());
+            if (isException)
+                throw new RuntimeException("Size of Menu bar is not correct.");
+        }
+   }
+}