Binder hilite could follow split editor selection

[dozy]

@KB

…Scrivener 3 has a solution: it has a secondary, more subtle highlight that indicates the document the focus is currently in. The binder won’t automatically expand to show it or scroll to it - you can still use Reveal in Binder for that - but it’s a really nice solution that provides the best of both worlds. (I can’t claim credit for it - I took the idea from Apple’s Xcode.)

From Xcode? of course… Almost there