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
* 
	 * @see org.eclipse.jface.window.Window#constrainShellSize()
	 */
	protected void constrainShellSize() {
		super.constrainShellSize();
		
		if (lastShellSize == null)
			lastShellSize = getShell().getSize();
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.dialogs.Dialog#createButtonsForButtonBar(org.eclipse.swt.widgets.Composite)
	 */
	protected void createButtonsForButtonBar(Composite parent) {
		
		okButton = createButton(parent, IDialogConstants.OK_ID, IDialogConstants.OK_LABEL, true);
		getShell().setDefaultButton(okButton);
		createButton(parent, IDialogConstants.CANCEL_ID, IDialogConstants.CANCEL_LABEL, false);
		if (isHelpAvailable) {
			createButton(parent, IDialogConstants.HELP_ID, IDialogConstants.HELP_LABEL, false);
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.window.Window#createContents(org.eclipse.swt.widgets.Composite)
	 */
	protected Control createContents(final Composite parent) {
		final Control[] control = new Control[1];