Bug 16759

I think bug 16758 regressed us on the Acid3 We added a failure: Test 10: FAIL (failed to handle regrafting correctly) function () { // test 10: walking outside a tree var doc = getTestDocument(); var p = doc.createElement('p'); doc.body.appendChild(p); var b = doc.body; var w = document.createTreeWalker(b, 0xFFFFFFFF, null, true); assert(w.currentNode == b, "basic use of TreeWalker failed: currentNode"); assert(w.lastChild() == p, "basic use of TreeWalker failed: lastChild()"); assert(w.previousNode() == b, "basic use of TreeWalker failed: previousNode()"); doc.documentElement.removeChild(b); assert(w.lastChild() == p, "TreeWalker failed after removing the current node from the tree"); assert(w.nextNode() == null, "failed to walk into the end of a subtree"); doc.documentElement.appendChild(p); assert(w.previousNode() == doc.getElementsByTagName('title')[0], "failed to handle regrafting correctly"); p.appendChild(b); assert(w.nextNode() == p, "couldn't retrace steps"); assert(w.nextNode() == b, "couldn't step back into root"); assert(w.previousNode() == null, "root didn't retake its rootish position"); return 1; },