Hi Edward FWIW (I haven't watched the whole video yet), the early parts of this reminded me a lot of the 'Origami' Editor for the Transputer Development System (TDS)
The Tab/Alt-TAB action of Origami to enter/leave 'integrated' outlines was terribly fast and intuitive. Origami is history these days but it might still be worth a play for insight. I ill try to find a link to a binary which works on recent systems. Regards Jon N -- You received this message because you are subscribed to the Google Groups "leo-editor" group. To unsubscribe from this group and stop receiving emails from it, send an email to leo-editor+unsubscr...@googlegroups.com. To post to this group, send email to leo-editor@googlegroups.com. Visit this group at https://groups.google.com/group/leo-editor. For more options, visit https://groups.google.com/d/optout.