Only update browser state on pjax success #660
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When an ajax request fails and you return false in the pjax:error event, I don't think pushState() should still be executed. When this happens you end up with an incorrect URL in the address bar. In my case, on a failure I display an alert to the user (404 not found, etc). In this case the user ends up with an inconsistent state, they see different content than the URL should provide, and if they refresh the page they'd get a whole new set of content.