8225220: When the Tab Policy is checked,the scroll button direction displayed incorrectly.

Backport-of: ed5b8c3a7bb6de27ab5050db494b08d5e5dd1c44

Author: GoeLin

src/java.desktop/share/classes/com/sun/java/swing/plaf/gtk/GTKEngine.java

@@ -337,7 +337,8 @@ static WidgetType getWidgetType(JComponent c, Region id) {
                 return widgets[0];
             }
         } else if (id == Region.ARROW_BUTTON) {
-            if (c.getParent() instanceof JScrollBar) {
+            if (c.getParent() instanceof JScrollBar
+                || c.getParent() instanceof JTabbedPane) {
                 Integer prop = (Integer)
                     c.getClientProperty("__arrow_direction__");
                 int dir = (prop != null) ?

test/jdk/javax/swing/JTabbedPane/TestJTabbedPaneArrowDirection.java

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2023, 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.
+ */
+
+import java.awt.BorderLayout;
+import java.awt.event.ActionEvent;
+import java.awt.GridLayout;
+import javax.swing.AbstractAction;
+import javax.swing.JButton;
+import javax.swing.JFrame;
+import javax.swing.JLabel;
+import javax.swing.JPanel;
+import javax.swing.JTabbedPane;
+import javax.swing.SwingUtilities;
+import javax.swing.UIManager;
+
+/*
+ * @test
+ * @bug 8225220
+ * @library /java/awt/regtesthelpers
+ * @build PassFailJFrame
+ * @requires (os.family == "linux")
+ * @summary JTabbedPane arrow should point to left or right direction
+ *          when tab layout policy is set to SCROLL_TAB_LAYOUT and tab
+ *          placement is set to either TOP or BOTTOM
+ * @run main/manual TestJTabbedPaneArrowDirection
+ */
+
+public class TestJTabbedPaneArrowDirection {
+    private static JFrame frame;
+    private static JTabbedPane tabPane;
+    private static final String INSTRUCTIONS =
+            "1. Observe the arrows are ponting to left and right direction\n" +
+               " for tab placement set to TOP. Default tab placement is TOP.\n\n" +
+            "2. Press BOTTOM to change the tab placement to bottom.\n\n" +
+            "3. Observe arrows are pointing to the left and right direction.\n\n" +
+            "4. If the behaviour is correct, press Pass else Fail.";
+
+    public static void main(String[] args) throws Exception {
+        UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel");
+        PassFailJFrame passFailJFrame = new PassFailJFrame.Builder()
+                .title("JTabbedPane Arrow Direction Test Instructions")
+                .instructions(INSTRUCTIONS)
+                .testTimeOut(5)
+                .rows(12)
+                .columns(40)
+                .screenCapture()
+                .build();
+        SwingUtilities.invokeAndWait(
+                TestJTabbedPaneArrowDirection::createAndShowUI);
+        passFailJFrame.awaitAndCheck();
+    }
+
+    private static void createAndShowUI() {
+        int NUM_TABS = 15;
+        frame = new JFrame("Test JTabbedPane Arrow Direction");
+        JTabbedPane tabPane = new JTabbedPane();
+        tabPane.setTabLayoutPolicy(JTabbedPane.SCROLL_TAB_LAYOUT);
+        tabPane.setTabPlacement(JTabbedPane.TOP);
+        PassFailJFrame.addTestWindow(frame);
+        PassFailJFrame.positionTestWindow(
+                frame, PassFailJFrame.Position.HORIZONTAL);
+        for( int i = 0; i < NUM_TABS; ++i) {
+            tabPane.addTab("Tab " + i , new JLabel("Content Area"));
+        }
+        JPanel panel = new JPanel(new BorderLayout());
+        panel.add(tabPane, BorderLayout.CENTER);
+        JButton topButton = new JButton(new AbstractAction() {
+            public void actionPerformed(ActionEvent e) {
+                tabPane.setTabPlacement(JTabbedPane.TOP);
+            }
+        });
+        topButton.setText("TOP");
+        JButton bottomButton = new JButton(new AbstractAction() {
+            public void actionPerformed(ActionEvent e) {
+                tabPane.setTabPlacement(JTabbedPane.BOTTOM);
+            }
+        });
+        bottomButton.setText("BOTTOM");
+        JPanel buttonPanel = new JPanel(new GridLayout(1, 2));
+        buttonPanel.add(topButton);
+        buttonPanel.add(bottomButton);
+        panel.add(buttonPanel, BorderLayout.SOUTH);
+        frame.add(panel);
+        frame.setSize(500, 500);
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setVisible(true);
+    }
+}