use *;
/// The reactive state the data demo page drives.
///
/// The page owns the tree's selection and how many toasts and
/// notifications the stacks are showing. The stacks are driven by a
/// count rather than by a list of items: a toast carries a callback,
/// and a callback cannot be compared, so a `Signal<Vec<…>>` of them
/// would not type-check — the count is the part that changes.
pub