Widget: SingleItemsWidget to check for 'structure' prefix in field's TALES method

and activate/disactivate html-escape accordingly

product/Formulator/Widget.py

@@ -862,19 +862,28 @@ class SingleItemsWidget(ItemsWidget):
         item_text = item
         item_value = item
 
+      no_escape = False
+      tales = field.tales.get("items", None)
+      if tales:
+        no_escape = tales.hasPrefix('structure')
+
       if item_value == value and not selected_found:
-        rendered_item = self.render_selected_item(escape(ustr(item_text)),
-                                                  item_value,
-                                                  key,
-                                                  css_class,
-                                                  extra_item)
+        rendered_item = self.\
+          render_selected_item(ustr(item_text) if no_escape else escape(ustr(item_text)),
+            item_value,
+            key,
+            css_class,
+            extra_item
+          )
         selected_found = 1
       else:
-        rendered_item = self.render_item(escape(ustr(item_text)),
-                                          item_value,
-                                          key,
-                                          css_class,
-                                          extra_item)
+        rendered_item = self.\
+          render_item(ustr(item_text) if no_escape else escape(ustr(item_text)),
+            item_value,
+            key,
+            css_class,
+            extra_item
+          )
 
       rendered_items.append(rendered_item)