Bug 295981 [Forms] FormImages & FormFonts are not disposed correctly
bundles/org.eclipse.ui.forms/src/org/eclipse/ui/forms/widgets/FormText.java
* <code>widgetDefaultSelected</code> is not called for FormText.
	 * </p>
	 * 
	 * @param listener
	 *            the listener
	 * @exception SWTException
	 *                <ul>
	 *                <li>ERROR_WIDGET_DISPOSED - if the receiver has been
	 *                disposed</li>
	 *                <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
	 *                thread that created the receiver</li>
	 *                </ul>
	 * @exception IllegalArgumentException
	 *                <ul>
	 *                <li>ERROR_NULL_ARGUMENT when listener is null</li>
	 *                </ul>
	 * @since 3.1
	 */
	public void addSelectionListener(SelectionListener listener) {
		checkWidget();
		if (listener == null) {
			SWT.error(SWT.ERROR_NULL_ARGUMENT);
		}
		TypedListener typedListener = new TypedListener(listener);
		addListener(SWT.Selection, typedListener);
	}
	/**
	 * Removes the specified selection listener.
	 * <p>
	 *