String (@Nullable VirtualFile file1, @Nullable VirtualFile file2) { FilePath path1 = file1 != null ? new LocalFilePath(file1.getPath(), file1.isDirectory()) : null; FilePath path2 = file2 != null ? new LocalFilePath(file2.getPath(), file2.isDirectory()) : null; return getTitle(path1, path2, DIFF_TITLE_SEPARATOR); }