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diff --git a/tests/org.eclipse.swt.tests/ManualTests/org/eclipse/swt/tests/manual/Bug528498_Combo_dropDownMenu_is_too_short.java b/tests/org.eclipse.swt.tests/ManualTests/org/eclipse/swt/tests/manual/Bug528498_Combo_dropDownMenu_is_too_short.java
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+++ b/tests/org.eclipse.swt.tests/ManualTests/org/eclipse/swt/tests/manual/Bug528498_Combo_dropDownMenu_is_too_short.java
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+/*******************************************************************************
+ * Copyright (c) 2018 Simeon Andreev and others. All rights reserved.
+ * The contents of this file are made available under the terms
+ * of the GNU Lesser General Public License (LGPL) Version 2.1 that
+ * accompanies this distribution (lgpl-v21.txt).  The LGPL is also
+ * available at http://www.gnu.org/licenses/lgpl.html.  If the version
+ * of the LGPL at http://www.gnu.org is different to the version of
+ * the LGPL accompanying this distribution and there is any conflict
+ * between the two license versions, the terms of the LGPL accompanying
+ * this distribution shall govern.
+ *
+ * Contributors:
+ *     Simeon Andreev - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.swt.tests.manual;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.Point;
+import org.eclipse.swt.graphics.Rectangle;
+import org.eclipse.swt.layout.FillLayout;
+import org.eclipse.swt.widgets.Combo;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Shell;
+
+
+/**
+ * Description: Combo box drop-down menu is narrower than combo itself, for read-only combos.
+ * Steps to reproduce:
+ * <ol>
+ * <li>click on main menu entry "Window"</li>
+ * <li>click on "Preferences"</li>
+ * <li>choose "Help"</li>
+ * <li>click on any combo in the preference page</li>
+ * </ol>
+ * Expected results: The drop down menu is as long as the combo.
+ * Actual results: The drop down menu is only as long as its longest entry.
+ */
+public class Bug528498_Combo_dropDownMenu_is_too_short {
+
+	public static void main (String [] args) {
+		Display display = new Display ();
+		final Shell shell = new Shell (display);
+		shell.setSize(200, 50);
+		shell.setLayout(new FillLayout());
+		shell.setLocation(center(display, shell));
+		shell.setText("Bug 528498");
+
+		Combo c = new Combo(shell, SWT.READ_ONLY);
+
+		for (int i = 0; i < 40; ++i) {
+			c.add("item " + i);
+		}
+
+		shell.open ();
+		while (!shell.isDisposed ()) {
+			if (!display.readAndDispatch ()) display.sleep ();
+		}
+		display.dispose ();
+	}
+
+	private static Point center(Display display, Shell shell) {
+		Rectangle displayBounds = display.getPrimaryMonitor().getBounds();
+		Point shellBounds = shell.getSize();
+		Point center = new Point(
+				displayBounds.x + (displayBounds.width - shellBounds.x) / 2,
+				displayBounds.y + (displayBounds.height - shellBounds.y) / 2);
+
+		return center;
+	}
+}