Andy Matuschak mode - V2.7 (updated for 0.7+ new panes)

[santi]

@death.au

This code forgoes the stacking titles, and allows the active pane to sit on top of all the others, while keeping a left “main” pane.

This is by far my favorite version of Andy Mode. Thank you so much for putting this together it works perfectly with version 0.9.6