code: void zeroWidthSpace(int indentLevel) throws IOException {
      if (closed) throw new IllegalStateException("closed");
  
      if (column == 0) return;
      if (this.nextFlush != null) flush(nextFlush);
      this.nextFlush = FlushType.EMPTY;
      this.indentLevel = indentLevel;
    }
docs: Emit a newline character if the line will exceed it's limit, otherwise do nothing.