8326497: Window.toFront() fails for iconified windows on Linux

Reviewed-by: tr, prr

src/java.desktop/unix/classes/sun/awt/X11/XFramePeer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2002, 2015, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2002, 2024, 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
@@ -328,6 +328,15 @@ void setExtendedState(int newState) {
         XWM.getWM().setExtendedState(this, newState);
     }
 
+    @Override
+    public void toFront() {
+        if ((state & Frame.ICONIFIED) != 0) {
+            changeState(state & ~Frame.ICONIFIED);
+        }
+
+        super.toFront();
+    }
+
     public void handlePropertyNotify(XEvent xev) {
         super.handlePropertyNotify(xev);
         XPropertyEvent ev = xev.get_xproperty();

src/java.desktop/windows/classes/sun/awt/windows/WFramePeer.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1996, 2021, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1996, 2024, 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
@@ -65,6 +65,16 @@ public int getExtendedState() {
         return AWTAccessor.getFrameAccessor().getExtendedState((Frame)target);
     }
 
+    @Override
+    public void toFront() {
+        int state = getState();
+        if ((state & Frame.ICONIFIED) != 0) {
+            setState(state & ~Frame.ICONIFIED);
+        }
+
+        super.toFront();
+    }
+
     // Convenience methods to save us from trouble of extracting
     // Rectangle fields in native code.
     private native void setMaximizedBounds(int x, int y, int w, int h);

test/jdk/java/awt/Frame/Iconify/IconifiedToFront.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2024, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2024, JetBrains s.r.o.. 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
+ * @key headful
+ * @bug 8326497
+ * @summary Verifies that an iconified window is restored with Window.toFront()
+ * @library /test/lib
+ * @run main IconifiedToFront
+ */
+
+import java.awt.Color;
+import java.awt.FlowLayout;
+import java.awt.Frame;
+import java.awt.Label;
+import java.awt.Robot;
+import java.awt.Toolkit;
+
+public class IconifiedToFront {
+    private static final int PAUSE_MS = 500;
+    private static Robot robot;
+
+    public static void main(String[] args) throws Exception {
+        if (!Toolkit.getDefaultToolkit().isFrameStateSupported(Frame.ICONIFIED)) {
+            return; // Nothing to test
+        }
+
+        robot = new Robot();
+        IconifiedToFront.test1();
+        IconifiedToFront.test2();
+    }
+
+    private static void test1() {
+        Frame frame1 = new Frame("IconifiedToFront Test 1");
+        try {
+            frame1.setLayout(new FlowLayout());
+            frame1.setSize(400, 300);
+            frame1.setBackground(Color.green);
+            frame1.add(new Label("test"));
+            frame1.setVisible(true);
+            pause();
+            frame1.setExtendedState(Frame.ICONIFIED);
+            pause();
+            frame1.toFront();
+            pause();
+            int state = frame1.getExtendedState();
+            if ((state & Frame.ICONIFIED) != 0) {
+                throw new RuntimeException("Test Failed: state is still ICONIFIED: " + state);
+            }
+        } finally {
+            frame1.dispose();
+        }
+    }
+
+    private static void test2() {
+        Frame frame1 = new Frame("IconifiedToFront Test 3");
+        try {
+            frame1.setLayout(new FlowLayout());
+            frame1.setSize(400, 300);
+            frame1.setBackground(Color.green);
+            frame1.add(new Label("test"));
+            frame1.setUndecorated(true);
+            frame1.setVisible(true);
+            pause();
+            frame1.setExtendedState(Frame.ICONIFIED);
+            pause();
+            frame1.toFront();
+            pause();
+            int state = frame1.getExtendedState();
+            if ((state & Frame.ICONIFIED) != 0) {
+                throw new RuntimeException("Test Failed: state is still ICONIFIED: " + state);
+            }
+        } finally {
+            frame1.dispose();
+        }
+    }
+
+    private static void pause() {
+        robot.delay(PAUSE_MS);
+        robot.waitForIdle();
+    }
+}