Minimum amount of values validator for multi value fields

Updated patch for 8.x-1.0-beta5 version

Re-upload full patch for 8.x-1.0-beta5 version

Hi, I've tested this patch and it worked as expected. For my purposes, this is an optional field. I would like it therefor, to either allow 0 values, but if there is any value at all that it be the minimum I set, which in my case is 3.

If that's possible, I would love to know how. Otherwise, I think my needs will be better met with custom code.

All that to say, since the patch works as expected I'm marking at as RTBC.

#9 is right, it is unusable with an unlimited value field.
But it is usefull for other case.
I made some small changes to the patch.

Here is some code that solve "add more" button issue:

function mycustom_form_alter(&$form, FormStateInterface &$form_state, $form_id) {
  if ($form_id == 'node_page_edit_form') {
    $form['field_mail']['widget']['add_more']['#limit_validation_errors'] = [];	  
  }
}

Automatically closed - issue fixed for 2 weeks with no activity.