Bug 94674 [Preferences] Preferences dialog separator under Title for pages does not stretch all the way across
The separator under the Header title for a preference page should stretch from the border of the sash to the far right with no margins in between.
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
* @since 3.1
	 */
	protected Layout getPageLayout() {
		return new PageLayout();
	}
	/**
	 * Creates the wizard's title area.
	 * 
	 * @param parent
	 *            the SWT parent for the title area composite.
	 * @return the created title area composite.
	 */
	protected Composite createTitleArea(Composite parent) {
		
		
		int margins = 2;
		titleArea = new Composite(parent, SWT.NONE);
		FormLayout layout = new FormLayout();
		layout.marginHeight = 0;
		layout.marginWidth = margins;
		titleArea.setLayout(layout);
		
		GridData layoutData = new GridData(GridData.FILL_HORIZONTAL);
		layoutData.heightHint = JFaceResources.getImage(PREF_DLG_TITLE_IMG).getBounds().height
				+ (margins * 3);
		titleArea.setLayoutData(layoutData);
		
		messageArea = new DialogMessageArea();
		messageArea.createContents(titleArea);
		titleArea.addControlListener(new ControlAdapter() {