code: function getUrlConsiderCommonPrefix(commonPrefix, currentComboUrls, basePrefix, comboPrefix, comboSep, suffix) {
          if (commonPrefix && currentComboUrls.length > 1) {
              var commonPrefixLen = commonPrefix.length;
              var currentUrls = [];
              for (var i = 0; i < currentComboUrls.length; i++) {
                  currentUrls[i] = currentComboUrls[i].substring(commonPrefixLen);
              }
              return basePrefix + commonPrefix + comboPrefix + currentUrls.join(comboSep) + suffix;
          } else {
              return basePrefix + comboPrefix + currentComboUrls.join(comboSep) + suffix;
          }
      }
docs: ??editor/plugin/x,editor/plugin/b => editor/plugin/??x,b