Sometimes scribbler editor does not show all available lines of editable copy for lists.

Sometimes the scribbler editor does not show all available lines of editable copy from lists. Some line items display outside of the editor view and scrolling the editor doesn't seem to scroll these unseen line items into view.

See: http://recordit.co/02FDAhdEKQ

Start by reproducing the list-editing problem in the scribbler editor using the linked recording as the reference case. Trace how list items are rendered and how the editor view handles scrolling; done means every editable line remains visible or can be reached by scrolling within the editor.

Written by the indexing model from the issue text.