Commits on May 8, 2024

1. tree: add render_node arg to __print_backend …

   This let us do inversion of control[1], passing in a callback function
   that gives more flexibility into how the node is rendered when using
   show() and save2file().
   
   **Example:**
   
   ```py
   def render_node(node):
     if node.level > 2:
       return node.my_property
     return node.some_other_property
   
   tree.show(render_node=render_node)
   ```
   
   [1]: https://en.wikipedia.org/wiki/Inversion_of_control

   

   rix1 committed May 8, 2024
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