without method
Implementation
InkList without(InkList listToRemove) {
var result = InkList.of(this);
result.removeWhere((k, v) => listToRemove.containsKey(k));
return result;
}
InkList without(InkList listToRemove) {
var result = InkList.of(this);
result.removeWhere((k, v) => listToRemove.containsKey(k));
return result;
}