In Blender 2.80 UI an option appeared with the name "Display Edges". it is indeed implemented in the RNA/DNA, but there is no logic connected to it.
In Blender 2.79 I am not able to see this option, might be an unfinished idea or legacy. whatever the reason we need to implement it or remove the code and manual.
the option was introduced by rBa3bb385ca0ba: Edit Mesh: Move Edit Mesh display settings to overlay's so seems like idea what was later removed