Use django_select2 everywhere in core.

biscuit/core/forms.py

 from django import forms
 from django.contrib.auth import get_user_model
 from django.utils.translation import ugettext_lazy as _
+from django_select2.forms import ModelSelect2MultipleWidget
 
 from .models import Person, Group, School, SchoolTerm
 
@@ -72,7 +73,11 @@ class EditGroupForm(forms.ModelForm):
     class Meta:
         model = Group
         fields = ['name', 'short_name', 'members', 'owners', 'parent_groups']
-
+        widgets = {
+            'members': ModelSelect2MultipleWidget(search_fields=['first_name__icontains', 'last_name__icontains', 'short_name__icontains']),
+            'owners': ModelSelect2MultipleWidget(search_fields=['first_name__icontains', 'last_name__icontains', 'short_name__icontains']),
+            'parent_groups': ModelSelect2MultipleWidget(search_fields=['name__icontains', 'short_name__icontains']),
+        }
 
 class EditSchoolForm(forms.ModelForm):
     class Meta:

biscuit/core/templates/core/edit_group.html

@@ -3,6 +3,16 @@
 {% extends "core/base.html" %}
 {% load bootstrap4 i18n %}
 
+{% block bootstrap4_extra_head %}
+  {{ block.super }}
+  {{ edit_group_form.media.css }}
+{% endblock %}
+
+{% block bootstrap4_extra_script %}
+  {{ block.super }}
+  {{ edit_group_form.media.js }}
+{% endblock %}
+
 {% block bootstrap4_title %}{% blocktrans %}Edit group{% endblocktrans %} - {{ block.super }}{% endblock %}
 
 {% block page_title %}{% blocktrans %}Edit group{% endblocktrans %}{% endblock %}