Work around IE11 contains() that does not recognize text nodes #72
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In IE11,
HTMLElement.prototype.containsalways returnsfalseif the argument is a text node. TheisConnectedpolyfill in can-dom-mutate already does some IE-specific polyfill on the presence ofNode.prototype.containsfor IE and can-vdom, so in this PR the polyfill is extended to look at the parent node instead if a text node is passed in.