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
saveEnableStateAndSet(helpButton, savedState, "help", false); 
        if (currentPage != null) {
			savedState
                    .put(
                            "page", ControlEnableState.disable(currentPage.getControl())); 
		}
        return savedState;
    }
    /**
     * Sets the given cursor for all shells currently active
     * for this window's display.
     *
     * @param c the cursor
     */
    private void setDisplayCursor(Cursor c) {
        Shell[] shells = getShell().getDisplay().getShells();
        for (int i = 0; i < shells.length; i++) {
			shells[i].setCursor(c);
		}
    }
    /**
     * Sets the minimum page size used for the pages.
     *
     * @param minWidth the minimum page width
     * @param minHeight the minimum page height
     * @see #setMinimumPageSize(Point)
     */
    public void setMinimumPageSize(int minWidth, int minHeight) {
        Assert.isTrue(minWidth >= 0 && minHeight >= 0);
        pageContainerLayout.minimumWidth = minWidth;