ns-ui / menu-nested-trays
Open Share, then Slack: the parent tray doesn't vanish behind a flyout, it shunts back and dims, leaving a 12px edge. Click any exposed edge to jump straight back to that level — or use ArrowRight/Enter to drill in and ArrowLeft/Escape to back out one level at a time.
Try it: open Share → Slack, then click the thin left edge to shunt straight back to File actions in one action instead of backing out twice.
selected → nothing yet