announce method

void announce()

Says the panel's values moved, without the shape having changed.

A knob's value is read live, so a host that re-lists always sees the truth — but nothing would have told it to look. This is what a slider being dragged inside the app posts. Coalesced by the transport's nudge, so a drag costs one wakeup rather than one per frame.

Implementation

void announce() => _panels._changed();