In cases where the container of a selected range lies within an existing annotation-hl, we want to find it's first parent that is _not_ an annotation highlight.
However, because of a bug in the jQuery selector, previously we were looking for the first parent that _is_ an annotator-hl - which was null in most cases, and an other annotator-hl in a few cases. (Which were then refused by the subsequent isAnnotator test.)

With this fix, now we can create annotations-within-annotations-within-annotations without any problems.