Include trees in your blueprints.
Note that this mod doesn't provide a way to craft and place trees by itself, you need to install some other mod that adds this (tested with Dectorio and Krastorio2, but it should work with other tree placing mods as well).
- You have to select at least one non-tree entity when creating the blueprint (you can then remove that entity in the blueprint dialog if you wish)
- No selection rectangles will show on trees when creating the blueprint
- When selecting new contents for an existing blueprint, trees won't be included
- Provide a way to toggle the tree blue printing on and off