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
pageContainer.setLayoutData(new GridData(GridData.FILL_BOTH));
		
		Label bottomSeparator = new Label(parent, SWT.HORIZONTAL | SWT.SEPARATOR);
		bottomSeparator.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.GRAB_HORIZONTAL));
		return composite;
	}
	/**
	 * Create the sash with right control on the right. Note 
	 * that this method assumes GridData for the layout data
	 * of the rightControl.
	 * @param composite
	 * @param rightControl
	 * @return Sash
	 * 
	 * @since 3.1
	 */
	protected Sash createSash(final Composite composite, final Control rightControl) {
		final Sash sash = new Sash(composite, SWT.VERTICAL);
		sash.setLayoutData(new GridData(GridData.FILL_VERTICAL));
		sash.setBackground(composite.getDisplay().getSystemColor(SWT.COLOR_LIST_BACKGROUND));
		
		
		sash.addListener(SWT.Selection, new Listener() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
			 */
			public void handleEvent(Event event) {
				if (event.detail == SWT.DRAG)