code: def _refine_color(color: str):
      """
      Convert color in #RGB (12 bits) format to #RRGGBB (32 bits), if it possible.
  
      Otherwise, it returns the original value. Graphviz does not support colors in #RGB format.
  
      :param color: Text representation of color
      :return: Refined representation of color
      """
      if len(color) == 4 and color[0] == "#":
          color_r = color[1]
          color_g = color[2]
          color_b = color[3]
          return (
              "#"
              + color_r
              + color_r
              + color_g
              + color_g
              + color_b
              + color_b
          )
      return color
  
file_path: airflow/airflow/utils/dot_renderer.py
imports: from __future__ import annotations
  import warnings
  from typing import TYPE_CHECKING, Any
  from airflow.exceptions import AirflowException
  from airflow.models.baseoperator import BaseOperator
  from airflow.models.mappedoperator import MappedOperator
  from airflow.utils.dag_edges import dag_edges
  from airflow.utils.state import State
  from airflow.utils.task_group import TaskGroup
label_desc: Use image node_id 1 for calling a global function with example usage: _refine_color(color) and returns: color, unknown