private void moveToUndoStorage(final VirtualFile file) {
    if (myStorageForUndo == null) {
      try {
        myStorageForUndo = FileUtil.createTempDirectory("svnUndoStorage", "");
      }
      catch (IOException e) {
        LOG.error(e);
        return;
      }
    }
    final File tmpFile = FileUtil.findSequentNonexistentFile(myStorageForUndo, "tmp", "");
    myUndoStorageContents.add(0, Couple.of(virtualToIoFile(file), tmpFile));
    virtualToIoFile(file).renameTo(tmpFile);
  }
private void moveToUndoStorage(final VirtualFile file)