Thank you for this PR @momocode-de!

I took time to look at it and one question arises: does this only change solves your DynamicFormBundle problem ? Or is this only a step ?

Right now i'm a bit hesitant here... if i(m not reading this badly, it would be a strong behaviour change:

When the second parameter $clearMissing is false, like with the "PATCH" method, the validation will only apply to the submitted fields. If you need to validate all the underlying data, add the required fields manually so that they are validated:

When submitting a form via a "PATCH" request, you may want to update only a few submitted fields. To achieve this, you may pass an optional second boolean argument to submit(). Passing false will remove any missing fields within the form object. Otherwise, the missing fields will be set to null.

https://symfony.com/doc/current/form/direct_submit.html

At least we would need some tests here, and a clear explanation of what would happen in the different scenario with some honest before/after.

Right now (and i'm very open to change my position)... i don't know... maybe you should first try to change this on your side? Because i'm not sure we should take this risk.. What do you think ?

Hi @momocode-de, does this really resolve the issue? I've come across this problem myself and tried locally your changes and unfortunately this solve didn't work for me. I understand we both have different environments, but this simple code snippet is still affected. Could you please provide an example of code that was fixed by your change? Maybe there were more steps to resolve the issue which I don't see.

$builder
  ->addDependent(
      name: 'value',
      dependencies: ['amount'],
      callback: function (DependentField $field, ?float $amount) {
          $field->add(
              type: NumberType::class,
              options: [
                  'required' => true,
                  'scale' => 2,
                  'disabled' => !$amount,
                  'data' => $amount ?? 0,
              ],
          );
      }
  )

I just opened SymfonyCasts/dynamic-forms#43, which is related here. I can confirm, that $form->submit($this->formValues, false); does solve my problem there.

Well, then .. do you guys think we could add some test here showing maybe the before/after ?

Also @momocode-de if you could rebase ?

After that,LGTM!

(let's also check/test as much possible in real conditions on the 2.x-dev branch before the release)