Adds the specified element so that it appears after the `after` element, with the specified `parent`. If `after` is None, then the element is inserted at the start. If `parent` is none, the element is added to the main list for this frame, otherwise it's added to a group. The return value is the commands to send to the storage layer to perform this update.
(&mut self, element_id: ElementId, parent: Option<ElementId>, after: Option<ElementId>)
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