app: allow to pass link_core into dynamic widget link generation

js/erp5_loader.js

@@ -3392,6 +3392,7 @@
    **/
   // TODO: move radio/check into property_dict and on item level?
   // TODO: not nice & find better handling for text elements and i18n tags
+  // TODO: core?
   map.listItem = function (item, wrapper, i) {
     var quirk_dict, level, core, new_item, section, pos, label, j, k, field,
       record;
@@ -3402,8 +3403,8 @@
     // link base
     if (quirk_dict.link && !quirk_dict.link_source) {
       level = quirk_dict.layout_level || 0;
-      core = quirk_dict.fragment_list ?
-          quirk_dict.fragment_list.slice(0, level + 1).join("/") : "";
+      core = quirk_dict.link_core || (quirk_dict.fragment_list ?
+          quirk_dict.fragment_list.slice(0, level + 1).join("/") : "");
     }
 
     new_item = {