code: function handleNameUpdate(newFilenameInputEl, fileId) {
          var newName = newFilenameInputEl.value,
              origExtension;
  
          if (newName !== undefined && qq.trimStr(newName).length > 0) {
              origExtension = getOriginalExtension(fileId);
  
              if (origExtension !== undefined) {
                  newName = newName + "." + origExtension;
              }
  
              spec.onSetName(fileId, newName);
          }
  
          spec.onEditingStatusChange(fileId, false);
      }
docs: Callback iff the name has been changed