getMultiselectController method
Implementation
PlexWidgetController<List<T>?> getMultiselectController() {
if (_multiSelectionController == null ||
_multiSelectionController!.isDisposed) {
_multiSelectionController =
(multiSelectionController ?? PlexWidgetController<List<T>?>());
_multiSelectionController!.setValue(multiInitialSelection?.cast<T>());
}
return _multiSelectionController!;
}