refactor

repertory/librepertory/src/file_manager/cache_size_mgr.cpp

@@ -93,6 +93,7 @@ auto cache_size_mgr::shrink(std::uint64_t size) -> api_error {
   if (cache_size_ >= size) {
     cache_size_ -= size;
   } else {
+    // TODO raise warning
     cache_size_ = 0U;
   }