Bug 29163 SafeRunnable needs to be accessible in JFace
We need to be able to access the SafeRunnable in JFace in order that some error protection can be added to preferences and properties dialogs.
bundles/org.eclipse.ui.workbench/extensions/org/eclipse/jface/dialogs/ErrorDialog.java
layout.horizontalSpacing =
			convertHorizontalDLUsToPixels(IDialogConstants.HORIZONTAL_SPACING);
		layout.numColumns = 2;
		composite.setLayout(layout);
		GridData childData = new GridData(GridData.FILL_BOTH);
		childData.horizontalSpan = 2;
		composite.setLayoutData(childData);
		composite.setFont(parent.getFont());
		return composite;
	}
	/*
	 * @see IconAndMessageDialog#createDialogAndButtonArea(Composite)
	 */
	protected void createDialogAndButtonArea(Composite parent) {
		super.createDialogAndButtonArea(parent);
		if (this.dialogArea instanceof Composite) {
			
			Composite dialogComposite = (Composite) dialogArea;
			if (dialogComposite.getChildren().length == 0)
				new Label(dialogComposite, SWT.NULL);
		}
	}
	/*
	 * @see IconAndMessageDialog#getImage()
	 */
	protected Image getImage() {
		if (status != null) {
			if (status.getSeverity() == IStatus.WARNING)
				return JFaceResources.getImageRegistry().get(DLG_IMG_WARNING);
			if (status.getSeverity() == IStatus.INFO)