LGTM.

@jongotlin Can you add some tests to ensure that we don't break this again in the future?

Ref#18850.

@jongotlin Did you check your PR respect the second sample of#18850 (comment)?

->add('test', TextType::class, ['mapped' =>false,'label' =>false,'attr' => ['placeholder' =>'My label goes here',    ]])

Also:

But in any case, this should not be handled like this IMHO but with acol-*-offset.

This does not see my issue. I download your patch and tried with this form config:

publicfunctionbuildForm(FormBuilderInterface$builder,array$options){$builder        ->add('domain',null, ['label' =>'ssl_certificate.form.domain','translation_domain' =>'front',        ])        ->add('subdomains', CollectionType::class, ['label' =>'ssl_certificate.form.subdomains','translation_domain' =>'front','type' => TextType::class,'allow_add' =>true,'allow_delete' =>true,'prototype' =>true,'options' => ['label' =>false,'text_suffix' =>'','attr' => ['class' =>'subdomain-domain',                ],            ],        ])    ;}

Result:

This solve not this issue:#18850 (comment)

Or the issue is not really related and in this case#18850 should be re-opened.

Please see this alternative:#19247

Thanks@soullivaneuh. I didn't think of the CollectionType-example you provided. I'll look into how it can be solved.

Not sure how to solve@soullivaneuh s issue. I guess also the prototype is affected. Anyone having an idea where to start?

@jongotlin I check vertical form, I have no issue about this at all.

The only solution I found is to correct the column classes in#19247.

Closing in favor of#19247