misc: expose cell in context when rendering its manager (#7346)

combo/manager/templatetags/cells.py

@@ -28,6 +28,7 @@ def cell_form(context, cell):
         context['form'] = form_class(instance=cell, prefix='c%s' % cell.get_reference())
     else:
         context['form'] = None
+    context['cell'] = cell
     cell_form_template = template.loader.get_template(cell.manager_form_template)
     with context.push():
         context.update(cell.get_extra_manager_context())