Prefix every alternative in a (possibly comma-separated) selector with a cell scope, so a, b becomes <scope> a, <scope> b. The adapter never emits selectors containing commas inside a single alternative, so a plain split is safe.
a, b
<scope> a, <scope> b
Prefix every alternative in a (possibly comma-separated) selector with a cell scope, so
a, bbecomes<scope> a, <scope> b. The adapter never emits selectors containing commas inside a single alternative, so a plain split is safe.