--- a/jdk/src/share/classes/com/sun/java/swing/plaf/windows/WindowsComboBoxUI.java	Tue Jul 30 16:15:31 2013 +0400
+++ b/jdk/src/share/classes/com/sun/java/swing/plaf/windows/WindowsComboBoxUI.java	Tue Jul 30 17:46:01 2013 +0400
@@ -499,7 +499,8 @@
 
         public void setItem(Object item) {
             super.setItem(item);
-            if (editor.hasFocus()) {
+            Object focus = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
+            if ((focus == editor) || (focus == editor.getParent())) {
                 editor.selectAll();
             }
         }

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/test/javax/swing/JComboBox/8015300/Test8015300.java	Tue Jul 30 17:46:01 2013 +0400
@@ -0,0 +1,119 @@
+/*
+ * Copyright (c) 2013, 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 com.sun.java.swing.plaf.windows.WindowsComboBoxUI.WindowsComboBoxEditor;
+import java.awt.Toolkit;
+import java.awt.event.ItemEvent;
+import java.awt.event.ItemListener;
+import javax.swing.ComboBoxEditor;
+import javax.swing.JComboBox;
+import javax.swing.JFrame;
+import javax.swing.JTextField;
+import javax.swing.UIManager;
+import sun.awt.SunToolkit;
+
+import static javax.swing.SwingUtilities.invokeAndWait;
+import static javax.swing.SwingUtilities.windowForComponent;
+import static javax.swing.WindowConstants.DISPOSE_ON_CLOSE;
+
+/*
+ * @test
+ * @bug 8015300
+ * @summary Tests that editable combobox select all text
+ * @author Sergey Malenkov
+ */
+
+public class Test8015300 {
+    private static final SunToolkit STK = (SunToolkit) Toolkit.getDefaultToolkit();
+    private static final String[] ITEMS = {
+            "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M",
+            "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z"};
+
+    private static JComboBox<String> combo;
+
+    public static void main(String[] args) throws Exception {
+        UIManager.LookAndFeelInfo[] array = UIManager.getInstalledLookAndFeels();
+        for (UIManager.LookAndFeelInfo info : array) {
+            UIManager.setLookAndFeel(info.getClassName());
+            System.err.println("L&F: " + info.getName());
+            invokeAndWait(new Runnable() {
+                @Override
+                public void run() {
+                    combo = new JComboBox<>(ITEMS);
+                    combo.addItemListener(new ItemListener() {
+                        @Override
+                        public void itemStateChanged(ItemEvent event) {
+                            if (ItemEvent.SELECTED == event.getStateChange() && combo.isEditable()) {
+                                ComboBoxEditor editor = combo.getEditor();
+                                Object component = editor.getEditorComponent();
+                                if (component instanceof JTextField) {
+                                    JTextField text = (JTextField) component;
+                                    boolean selected = null != text.getSelectedText();
+
+                                    StringBuilder sb = new StringBuilder();
+                                    sb.append(" - ").append(combo.getSelectedIndex());
+                                    sb.append(": ").append(event.getItem());
+                                    if (selected) {
+                                        sb.append("; selected");
+                                    }
+                                    System.err.println(sb);
+                                    if ((editor instanceof WindowsComboBoxEditor) == (null == text.getSelectedText())) {
+                                        throw new Error("unexpected state of text selection");
+                                    }
+                                }
+                            }
+                        }
+                    });
+                    JFrame frame = new JFrame(getClass().getSimpleName());
+                    frame.add(combo);
+                    frame.pack();
+                    frame.setLocationRelativeTo(null);
+                    frame.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
+                    frame.setVisible(true);
+                }
+            });
+            for (int i = 0; i < ITEMS.length; ++i) {
+                select(i, true);
+                select(1, false);
+            }
+            invokeAndWait(new Runnable() {
+                @Override
+                public void run() {
+                    windowForComponent(combo).dispose();
+                }
+            });
+        }
+    }
+
+    private static void select(final int index, final boolean editable) throws Exception {
+        invokeAndWait(new Runnable() {
+            @Override
+            public void run() {
+                combo.setEditable(editable);
+                combo.setSelectedIndex(index);
+            }
+        });
+        STK.realSync();
+        Thread.sleep(50L);
+    }
+}