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timothy@apple.com authored
https://bugs.webkit.org/show_bug.cgi?id=123924 Reviewed by Joseph Pecoraro. * UserInterface/TreeOutline.js: (TreeOutline.prototype.appendChild): Don't force create _childrenListNode, it will be created when the tree element is expanded. Only attach if _childrenListNode already exists. (TreeOutline.prototype.insertChild): Ditto. (TreeOutline.prototype.getCachedTreeElement): Check the value of __treeElementIdentifier not just the existence of the property. It should never be null/undefined/0, but be safe. (TreeOutline.prototype.findTreeElement): Null check isAncestor, it isn't required. git-svn-id: http://svn.webkit.org/repository/webkit/trunk@161677 268f45cc-cd09-0410-ab3c-d52691b4dbfc
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