Items: Allow plugins to put forms above a formset

src/pretix/control/signals.py

@@ -310,9 +310,13 @@ an instance of a form class that you bind yourself when appropriate. Your form w
 as part of the standard validation and rendering cycle and rendered using default bootstrap
 styles. It is advisable to set a prefix for your form to avoid clashes with other plugins.
 
-Your forms may also have two special properties: ``template`` with a template that will be
-included to render the form, and ``title``, which will be used as a headline. Your template
-will be passed a ``form`` variable with your form.
+Your forms may also have special properties:
+
+- ``template`` with a template that will be included to render the form. Your template will be passed a ``form``
+  variable with your form.
+- ``title``, which will be used as a headline.
+- ``ìs_layouts = True``, if your form should be grouped with the ticket layout settings (mutually exclusive with setting ``title``).
+- ``group_with_formset = True``, if your form should be grouped with a formset of the same ``title``
 
 As with all event plugin signals, the ``sender`` keyword argument will contain the event.
 """

src/pretix/control/templates/pretixcontrol/item/index.html

@@ -177,6 +177,18 @@
                     {% for v in formsets.values %}
                         <fieldset>
                             <legend>{{ v.title }}</legend>
+
+                            {% for f in plugin_forms %}
+                                {% if f.group_with_formset and f.title == v.title %}
+                                    {% if f.template and not "template" in f.fields %}
+                                        {% include f.template with form=f %}
+                                    {% else %}
+                                        {% bootstrap_form f layout="control" %}
+                                    {% endif %}
+                                    <hr />
+                                {% endif %}
+                            {% endfor %}
+
                             {% include v.template with formset=v %}
                         </fieldset>
                     {% endfor %}
@@ -276,7 +288,7 @@
                         {% endfor %}
                     </fieldset>
                     {% for f in plugin_forms %}
-                        {% if not f.is_layouts and f.title %}
+                        {% if not f.is_layouts and not f.group_with_formset and f.title %}
                             <fieldset>
                                 <legend>{{ f.title }}</legend>
                                 {% if f.template and not "template" in f.fields %}