RepeaterFieldWidget class

repeater. One card per row, built by walking RepeaterComponent.children — the item template, published once and walked once per row in the value, never re-parsed per row.

Row values live in the form state as a genuine List<Map> under this field's own name. Editing a child field in one row replaces only that row's map inside a freshly-built list — every other row's map is the same object it was before — so a flat-state bug that lets two rows share one value cannot hide here: row 1 changing would mean row 1's map itself changed, and it never does from an edit inside row 2.

component.readOnly (the server's own rule) or state.enabled == false (a host or closure-driven gate) renders every row inert with no Add or Remove control — the same "server's word wins" rule FileFieldWidget follows for a picker the host did supply.

Per-row errors reuse the form's existing flat error map rather than a new channel: client_validator.dart keys a required child empty in row 2 as '<name>.1.<child>', the same shape a server 422 uses for items.0.name, and this widget reads it out of FieldState.errors — never a generic message for the whole field.

Nested repeaters are out of scope: a repeater inside a repeater's template renders through this same widget recursively, and the walker publishes a nested one readOnly: true — so there is no special case here beyond honouring that flag like any other. (Until P6c's close-out nothing published it: a nested repeater arrived editable, and its 422 came back keyed outer.0.inner.1.x, which this widget has no field to render against — a form that could not be submitted and could not say why. The server publishes the flag now; this docblock describes what ships.)

registry is the host's own — the same registry that built this widget — so a host-registered field type, or a host override of a built-in one, renders inside a row exactly as it does everywhere else on the form. Null falls back to the defaults, for a caller constructing this widget directly rather than through FieldRegistry.build.