Bug 137315 [Dialogs] Doubleclickable area to restore dialog size is often very small
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/Dialog.java
* The dialog area; <code>null</code> until dialog is layed out.
	 */
	protected Control dialogArea;
	/**
	 * The button bar; <code>null</code> until dialog is layed out.
	 */
	public Control buttonBar;
	
	/**
	 * A mouse listener that can be used to restore the default size
	 * of a dialog.  
	 * 
	 * @since 3.2
	 */
	private MouseListener restoreSizeMouseListener = new MouseAdapter() {
		public void mouseDoubleClick(MouseEvent event) {
			restoreDialogToComputedSize();
		}
	};
	/**
	 * Collection of buttons created by the <code>createButton</code> method.
	 */
	private HashMap buttons = new HashMap();
	/**
	 * Font metrics to use for determining pixel sizes.
	 */
	private FontMetrics fontMetrics;
	
	/**
	 * Point used for storing initial computed size of the dialog so