anchor.diff:                        ),
                       Expanded(
                         child: DropdownButtonFormField<int>(
  -                        decoration:
  -                            const InputDecoration(label: Text('Digits')),
  +                        decoration: const InputDecoration(labelText: 'Digits'),
                           value: _digits,
                           items: [6, 7, 8]
                               .map((e) => DropdownMenuItem(
  
positive.code:                             FilteringTextInputFormatter.digitsOnly,
                            ],
                            decoration: InputDecoration(
                              label: const Text('Period'),
                              errorText: _period > 0
                                  ? null
                                  : 'Must be a positive number',
  
negative.code:                     Expanded(
                        child: DropdownButtonFormField<HashAlgorithm>(
                          decoration:
                              const InputDecoration(labelText: 'Algorithm'),
                          value: _hashAlgorithm,
                          items: HashAlgorithm.values
                              .map((e) => DropdownMenuItem(
  