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

24 KiB

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