backoffice: make submission sidebar items configurable (#84494)

(also #58888)

@@ -375,0 +376,4 @@
+            ('none', _('No user'), 'none'),
+            ('any', _('Any user (optional)'), 'any'),
+            ('any-required', _('Any user (required)'), 'any-required'),
+            ('roles', _('User with appropriate role'), 'roles'),

@@ -546,1 +550,4 @@
                     new_value = widget.parse()
+                    if attr == 'submission_user_association':
+                        # keep user_support option in sync (only relevant for cards)
+                        self.formdef.user_support = 'optional' if new_value != 'none' else None

@@ -177,0 +183,4 @@
+        page_error_messages = kwargs.pop('page_error_messages', None) or []
+        if self.is_missing_user() and not kwargs.get('arrival'):
+            page_error_messages.append(self.required_user_message)
+        return super().page(page, *args, **kwargs, page_error_messages=page_error_messages)

@@ -177,0 +188,4 @@
+    def validating(self, *args, **kwargs):
+        if self.is_missing_user():
+            page_error_messages = kwargs.pop('page_error_messages', None) or []
+            return self.page(self.pages[-1], page_change=False, page_error_messages=page_error_messages)

@@ -338,4 +348,0 @@
-        excluded_parts = []
-        if not self.user_support:
-            excluded_parts.append('user')
-        return [x for x in super().get_submission_sidebar_available_items() if x[0] not in excluded_parts]

@@ -372,1 +372,3 @@
-                if carddef.can_user_add_cards(get_request().user):
+                if (
+                    carddef.can_user_add_cards(get_request().user)
+                    and carddef.submission_user_association != 'any-required'

@@ -205,3 +195,1 @@
-        dataType: 'json',
-        data: function(params) {
-          return {q: params.term, limit: 10};
+    $('select.user-selection').each(function(idx, elem) {