It was entirely predictable that last spring, after Safeway announced that it had agreed to accept a $9.2 billion offer from the private equity firm Cerberus Capital, shareholders would rush to file suits challenging the deal. As you know, shareholder M&A suits have become an inevitable consequence of merger announcements, and, to the frustration of defendants, are often brought in more than one jurisdiction — which has meant, in years past, that if defendants couldn’t persuade judges to defer to other courts, they sometimes had to defend against the same claims by multiple plaintiffs firms in multiple courts.