on propose les tags uniquement dans la liste des existants:

Fix #217

src/agenda_culturel/forms.py

@@ -159,12 +159,20 @@ class DynamicArrayWidgetTags(DynamicArrayWidget):
 class RecurrentImportForm(ModelForm):
     required_css_class = 'required'
 
+    defaultTags = MultipleChoiceField(
+        label=_("Tags"),
+        initial=None,
+        choices=[],
+        required=False
+    )
+
     class Meta:
         model = RecurrentImport
         fields = "__all__"
-        widgets = {
-            "defaultTags": DynamicArrayWidgetTags(),
-        }
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.fields["defaultTags"].choices = Tag.get_tag_groups(all=True)
 
 
 class CategorisationRuleImportForm(ModelForm):

src/agenda_culturel/templates/agenda_culturel/recurrentimport_form.html

@@ -6,6 +6,8 @@
 {% block configurer-bouton %}{% endblock %}
 
 {% block entete_header %}
+<script src="{% static 'choicejs/choices.min.js' %}"></script>
+
 <script src="/static/admin/js/vendor/jquery/jquery.js"></script>
 <script src="/static/admin/js/jquery.init.js"></script>
 <link href="{% static 'css/django_better_admin_arrayfield.min.css' %}" type="text/css" media="all" rel="stylesheet">
@@ -26,4 +28,35 @@
     </form>
 </article>
 
+<script>
+        show_firstgroup = {
+                choice(classes, choice) {
+                    const i = Choices.defaults.templates.choice.call(this, classes, choice);
+                    if (this.first_group !== null && choice.groupId == this.first_group)
+                        i.classList.add("visible");
+                    return i;
+                },
+                choiceGroup(classes, group) {
+                    const g = Choices.defaults.templates.choiceGroup.call(this, classes, group);
+                    if (this.first_group === undefined && group.value == "Suggestions")
+                        this.first_group = group.id;
+                    if (this.first_group !== null && group.id == this.first_group)
+                       g.classList.add("visible");
+                    return g;
+                }
+    };
+
+    const tags = document.querySelector('#id_defaultTags');
+    const choices_tags = new Choices(tags,
+        {
+            placeholderValue: 'Sélectionner les étiquettes par défaut',
+            allowHTML: true,
+            delimiter: ',',
+            removeItemButton: true,
+            shouldSort: false,
+            callbackOnCreateTemplates: () => (show_firstgroup)
+        }
+    );
+</script>
+
 {% endblock %}