Bug 134266 [Wizard] Page description not set if page message already set
Since page messages such as errors and warnings used to be displayed in the same widget as the page description, code was put in place in WizardDialog#updateDescriptionMessage() to avoid setting the page description if there was already a message. As of 3.2 M6 there is a separate widget for displaying error and warning messages and so the page description should always be set.
bundles/org.eclipse.jface/src/org/eclipse/jface/wizard/WizardDialog.java
* @param newWizard the wizard this dialog is working on
     */
    public WizardDialog(Shell parentShell, IWizard newWizard) {
        super(parentShell);
        setShellStyle(SWT.CLOSE | SWT.TITLE | SWT.BORDER
                | SWT.APPLICATION_MODAL | SWT.RESIZE | getDefaultOrientation());
        setWizard(newWizard);
        
        
        cancelListener = new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
                cancelPressed();
            }
        };
    }
    /**
     * About to start a long running operation triggered through
     * the wizard. Shows the progress monitor and disables the wizard's
     * buttons and controls.
     *
     * @param enableCancelButton <code>true</code> if the Cancel button should
     *   be enabled, and <code>false</code> if it should be disabled
     * @return the saved UI state
     */
    private Object aboutToStart(boolean enableCancelButton) {
        Map savedState = null;
        if (getShell() != null) {
            
            Control focusControl = getShell().getDisplay().getFocusControl();
            if (focusControl != null && focusControl.getShell() != getShell()) {