`pat-plone-modal` and `pat-validation` issues

[petschki]

When showing forms with pat-validation enabled inside pat-plone-modal, disabling the submit button(s) on validation errors doesn't work.

Background

Since pat-plone-modal moves all form actions into the modal-footer (which is outside the original form node) the disabledSelector parameter for pat-validation doesn't find the correct submit button (actually it finds the hidden button inside the modal form 😒 )