@NotNull
  private Collection<Integer> getDirtyFiles(@NotNull DirtyFiles dirtyFiles, @Nullable Project project) {
    IntSet dirtyFileIds = new IntOpenHashSet();
    ProjectDirtyFiles dirtyFilesSet = dirtyFiles.getProjectDirtyFiles(project);
    if (dirtyFilesSet != null) dirtyFilesSet.addAllTo(dirtyFileIds);
    return dirtyFileIds;
  }
@NotNull
  private Collection<Integer> getDirtyFiles(@NotNull DirtyFiles dirtyFiles, @Nullable Project project)