refactor

src/file_manager/file_manager.cpp

@@ -400,12 +400,6 @@ auto file_manager::open(const std::string &api_path, bool directory,
   return api_error::success;
 }
 
-auto file_manager::perform_locked_operation(
-    locked_operation_callback locked_operation) -> bool {
-  recur_mutex_lock open_lock(open_file_mtx_);
-  return locked_operation(provider_);
-}
-
 void file_manager::queue_upload(const i_open_file &o) {
   return queue_upload(o.get_api_path(), o.get_source_path(), false);
 }