8234315: GTK LAF does not gray out disabled JMenu

src/java.desktop/unix/native/libawt_xawt/awt/gtk3_interface.c

@@ -2354,6 +2354,9 @@ static gint gtk3_get_color_for_state(JNIEnv *env, WidgetType widget_type,
         if ((widget_type == TEXT_FIELD || widget_type == PASSWORD_FIELD || widget_type == SPINNER_TEXT_FIELD ||
             widget_type == FORMATTED_TEXT_FIELD) && state_type == GTK_STATE_SELECTED && color_type == TEXT_BACKGROUND) {
             widget_type = TEXT_AREA;
+        } else if (widget_type == MENU_BAR && state_type == GTK_STATE_INSENSITIVE
+            && color_type == FOREGROUND) {
+            widget_type = MENU;
         }
     }
 

test/jdk/javax/swing/JMenu/TestDisabledMenuForegroundColor.java

@@ -0,0 +1,127 @@
+/*
+ * Copyright (c) 2022, 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 8234315
+ * @key headful
+ * @requires (os.family == "linux")
+ * @summary Verifies if disabled menu foreground color grayed out
+ * @run main TestDisabledMenuForegroundColor
+ */
+
+import java.awt.Color;
+import java.awt.Point;
+import java.awt.Rectangle;
+import java.awt.Robot;
+import java.awt.image.BufferedImage;
+import java.io.File;
+import javax.imageio.ImageIO;
+import javax.swing.JFrame;
+import javax.swing.JMenu;
+import javax.swing.JMenuBar;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+
+public class TestDisabledMenuForegroundColor {
+
+    private static JFrame frame;
+    private static JMenuBar menuBar;
+    private static JMenu fileMenu;
+
+    public static void main(String[] args) throws Exception {
+        UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel");
+        Robot robot = new Robot();
+        robot.setAutoDelay(100);
+        try {
+            SwingUtilities.invokeAndWait(() -> {
+                createAndShowUI();
+            });
+
+            robot.waitForIdle();
+            robot.delay(1000);
+            Point pt = fileMenu.getLocationOnScreen();
+            BufferedImage enabledImg =
+                    robot.createScreenCapture(new Rectangle(pt.x, pt.y,
+                                              fileMenu.getWidth(),
+                                              fileMenu.getHeight()));
+            fileMenu.setEnabled(false);
+            robot.waitForIdle();
+            robot.delay(1000);
+            BufferedImage disabledImg =
+                    robot.createScreenCapture(new Rectangle(pt.x, pt.y,
+                                              fileMenu.getWidth(),
+                                              fileMenu.getHeight()));
+            boolean passed = compareImage(enabledImg,disabledImg);
+
+            if (!passed) {
+                ImageIO.write(enabledImg, "png", new File("JMenuEnabledImg.png"));
+                ImageIO.write(disabledImg, "png", new File("JMenuDisabledImg.png"));
+                throw new RuntimeException("Disabled JMenu foreground color not grayed out");
+            }
+        } finally {
+            SwingUtilities.invokeAndWait(() -> {
+                if (frame != null) {
+                    frame.dispose();
+                }
+            });
+        }
+    }
+
+    private static void createAndShowUI() {
+        frame = new JFrame("Test Disabled Menu Foreground Color");
+        menuBar  = new JMenuBar();
+        fileMenu = new JMenu("File");
+        fileMenu.setEnabled(true);
+        menuBar.add(fileMenu);
+        frame.setJMenuBar(menuBar);
+        frame.pack();
+        frame.setSize(250, 200);
+        frame.setLocationRelativeTo(null);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setVisible(true);
+    }
+
+    /*
+    * Compare JMenu enabled and disabled state image and if both images
+    * width and height are equal but pixel's RGB values are not equal,
+    * method returns true; false otherwise.
+    */
+
+    private static boolean compareImage(BufferedImage img1, BufferedImage img2) {
+        if (img1.getWidth() == img2.getWidth()
+                && img1.getHeight() == img2.getHeight()) {
+            for (int x = 1; x < img1.getWidth()-1; ++x) {
+                for (int y = 1; y < img1.getHeight()-1; ++y) {
+                    if (img1.getRGB(x, y) != img2.getRGB(x, y)) {
+                        return true;
+                    }
+                }
+            }
+            return false;
+        } else {
+            return false;
+        }
+    }
+}
+