CMS-3952 Wrong behavior: when new child added to expanded content, paren...

...t content becomes collapsed.
This is strange. The `this.root` will always be true, so the `var root` will always be `this.root` and not the `this.stash`. If it was intend to be so, maybe we do not need this row at all? It'll be simpler to use `this,root` directly or write `var root = this.root`