removeAll method
Removes all occurrences of all items
from this list.
Same as calling removeMany for each item in items
.
The method has no effect if item
was not in the list.
Implementation
IList<T> removeAll(Iterable<T?> items) {
final L<T> result = _l.removeAll(items);
return identical(result, _l) ? this : IList<T>._unsafe(result, config: config);
}