Perspectives tabs break Form API #states

This patch fixes the issue for my situation.

As you can see it's a very simple solution, even simpler than adding a wrapper like I suggested in the initial post. I have to thank @berdir for suggesting this approach. In fact, I don't quite understand why it works in the first place - if we're calling show() on elements that are not hidden, why are we show()ing them to begin with? But anyway, it works.

If you want to reproduce the problem: I tested this patch with the combination of the lockable-behavior from the paragraphs_collection module and a form alter which looks like this:

/**
 * Implements hook_field_widget_WIDGET_TYPE_form_alter().
 */
function mymodule_field_widget_paragraphs_form_alter(&$element, &$form_state, $context) {
  if (!empty($element['subform']['field_dependee'])) {
    $parents_array = $element['subform']['#parents'];
    $parents = array_shift($parents_array) . '[' . implode('][', $parents_array) . ']';
    if (!empty($element['subform']['field_dependent'])) {
      $element['subform']['field_dependent']['#states'] = [
        'visible' => [
          ':input[name="' . $parents . '[field_dependee]"]' => [
            'value' => (string) 'some value',
          ],
        ],
      ];
    }
  }
}