Bug 132821 [Dialogs] Stored Dialog location and size invalid after changing font
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
* @param dlus
	 *            the number of horizontal dialog units
	 * @return the number of pixels
	 */
	protected int convertHorizontalDLUsToPixels(int dlus) {
		
		if (fontMetrics == null) {
			return 0;
		}
		return convertHorizontalDLUsToPixels(fontMetrics, dlus);
	}
	/**
	 * Returns the number of pixels corresponding to the given number of
	 * vertical dialog units.
	 * <p>
	 * This method may only be called after <code>initializeDialogUnits</code>
	 * has been called.
	 * </p>
	 * <p>
	 * Clients may call this framework method, but should not override it.
	 * </p>
	 * 
	 * @param dlus
	 *            the number of vertical dialog units
	 * @return the number of pixels
	 */
	protected int convertVerticalDLUsToPixels(int dlus) {
		
		if (fontMetrics == null) {
			return 0;