Hide group if all fields are hidden by javascript

This should resolve the Drupal 10 issues.

This patch is nice and working well except if we are adding fields in an empty group in the hook form_alter.
I am using the following function to add $form[$field_name] to a group (id=$group_name):

function addToGroup(array &$form, string $field_name, string $group_name)
{
  /** @var EntityFormDisplay $form_display */
  $form_display = $form['#process'][1][0];
  $form[$field_name]['#group'] = $group_name;
  $field_group = $form_display->getThirdPartySettings('field_group')[$group_name];
  $field_group['children'][] = $field_name;
  $form_display->setThirdPartySetting('field_group', $group_name, $field_group);
  }
}

If I add $form['field_to_add'] in a group which is empty but which have the option "Display element also when empty" checked; then the group is not displayed.

To summarize, there are 2 issues:
1-The patch doesn't take into account the option Display element also when empty
2-The patch doesn't take into account any element added to the group in the form_alter hook

The patch works correcly on initial load, but it does not seems to work correctly when detecting a change.
We have a fieldset containing 3 fields that can be shown/hidden depending on when another checkbox field is checked (we use conditional_fields for this).
The field group is initially hidden but if I make the fields visible then hide them, the field group is not hidden and is displayed empty.

This seems to happen because when Drupal.FieldGroup.hideGroupIfEmpty() evaluate the display property of the fields, the last does not have none yet. So it might be some kind of race condition that makes it check the field too soon.
If I do something like this, then it works correctly:

diff --git a/formatters/fieldset/fieldset.js b/formatters/fieldset/fieldset.js
index 7349be4..3a2f052 100644
--- a/formatters/fieldset/fieldset.js
+++ b/formatters/fieldset/fieldset.js
@@ -34,7 +34,9 @@
         if ($(e.target).hasClass('field-group-child-field')) {
           let $group = $(e.target).closest('.field-group-fieldset');
           if ($group.length !== 0) {
-            Drupal.FieldGroup.hideGroupIfEmpty($group, null, true);
+            setTimeout(function () {
+              Drupal.FieldGroup.hideGroupIfEmpty($group, null, true);
+            }, 500);
           }
         }
       });

(This is obviously not the way to the fix the problem, but it helps demonstrate it.)

Patch failed on field_group 3.6 and Drupal 10.3

Hello everyone,
Re-holl of patch field_group-2978747-40.patch (8.x-3.0), now covering the module version 8.x-3.6.