Patrik Svensson 8261b25e5c Fix tree rendering
Fixes some tree rendering problems where lines were not properly drawn
at some levels during some circumstances.

* Change the API back to only allow one root.
* Now uses a stack based approach to rendering instead of recursion.
* Removes the need for measuring the whole tree in advance.
  Leave this up to each child to render.
2021-01-10 15:55:11 +01:00
..
2020-12-28 17:28:03 +01:00
2021-01-10 15:55:11 +01:00