Function filter_body

fn filter_body(
    ui: &mut Ui,
    f: &mut AudioFilter,
    bus_id: u64,
    i: usize,
    time: f64,
    palette: &Palette,
    state: &mut MixerState,
    g: &mut Gesture,
    n: usize,
)

One filter’s editable half: its response curve and its parameter grid. Shared by the strip and by the pop-out window, so a floating filter is the same control surface, not a second implementation.