private @NotNull CharSequence deleteIndents(@NotNull CharSequence buffer, int startOffset, int endOffset) {
    StringBuilder result = new StringBuilder();

    int offset = startOffset;
    for (DeletedIndentInfo deletion : myDeletions) {
      result.append(buffer.subSequence(offset, deletion.getRealPos()));
      deletion.setShrunkPos(result.length());
      offset = deletion.getRealPos() + deletion.getLength();
    }
    result.append(buffer.subSequence(offset, endOffset));

    return result.toString();
  }
private @NotNull CharSequence deleteIndents(@NotNull CharSequence buffer, int startOffset, int endOffset)