@ApiStatus.Experimental
  public void offlineByDefault(@NotNull VirtualFile file, boolean offlineByDefaultFlag) {
    setFlag(file, Flags.OFFLINE_BY_DEFAULT, offlineByDefaultFlag);
    if (offlineByDefaultFlag) {
      ((VirtualFileSystemEntry)file).setOffline(true);
    }
  }
@ApiStatus.Experimental
  public void offlineByDefault(@NotNull VirtualFile file, boolean offlineByDefaultFlag)