Generate a unique, currently-unused key for a new record entry. Picks the first of key, key-1, key-2, … that is not in existing. Mirrors react/headlessRenderers.tsx::nextRecordKey.
key
key-1
key-2
existing
react/headlessRenderers.tsx::nextRecordKey
Generate a unique, currently-unused key for a new record entry. Picks the first of
key,key-1,key-2, … that is not inexisting. Mirrorsreact/headlessRenderers.tsx::nextRecordKey.