bug#48580: Outline Mode using Phylogenetic Tree Nomenclature

[Eli Zaretskii]

> From: pietru@caramail.com
> Date: Sat, 22 May 2021 09:56:15 +0200
> Sensitivity: Normal
> 
> I advise and lay out a system based on a formal Phylogenetic Tree that 
> implement
> Show-Hide Options.
> 
> Show All (currently: Show All [unchanged])
> Show Offsprings (currently: Show Children)
> Show Descendants  (currently: Show Branches)
> Show Sub-Tree (currently: Show Subtree [unchanged])
> Show Common Level (currently: Hide Sublevels)
> 
> Hide Sub-Branches (currently: Hide Leaves - meaning Hide Body after heading)
> Hide Branches (currently: Hide Body, leaves all headings visible)
> Hide Current Branch (currently: Hide Entry - hide body of this heading)
> Hide Sub-Tree (currently: Hide Subtree [unchanged])
> Hide Other (currently: Hide Other [unchanged])

FWIW, if I were presented with the menu labels as you suggest, I'd be
mightily confused by the unfamiliar terminology.  "Branches",
"Levels", "Children", and "Tree" are familiar terms when dealing with
tree structures, whereas "Offsprings", "Descendants" and
"Sub-branches" aren't.