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/ProgressMonitorDialog.java
private void setOperationCancelButtonEnabled(boolean b) {
	operationCancelableState = b;
	cancel.setEnabled(b);
}
/*
 * @see org.eclipse.jface.dialogs.IconAndMessageDialog#getImage()
 */
protected Image getImage() {
	return JFaceResources.getImageRegistry().get(Dialog.DLG_IMG_INFO);
}
	
/**
 * Set the message in the message label.
 */
private void setMessage(String messageString) {
	message = messageString;
	if (messageLabel == null || messageLabel.isDisposed())
		return;
	messageLabel.setText(message);
}
/**
 * Update the message label. Required if the monitor is forked.
 */
private void update() {
	if (messageLabel == null || messageLabel.isDisposed())
			return;	
	messageLabel.update();
}
}