allowMultipleSelections top-level property
A facet that, when enabled, causes the editor to allow multiple ranges to be selected.
Be careful though, because by default the editor relies on the native
DOM selection, which cannot handle multiple selections. An extension
like drawSelection can be used to make secondary selections visible
to the user.
Implementation
final Facet<bool, bool> allowMultipleSelections = Facet.define(
FacetConfig(combine: (values) => values.any((v) => v), isStatic: true),
);