Builds a BusyHandle from a dismiss function (and optional updaters). Used to wrap the plain hideBusy callbacks that providers produce, and to supply inert no-op handles where no provider is present.
hideBusy
Builds a BusyHandle from a dismiss function (and optional updaters). Used to wrap the plain
hideBusycallbacks that providers produce, and to supply inert no-op handles where no provider is present.