How to create tree with 1+n roots?

[Frit]

tree field is waiting for object
e.g.
state = { tree: { "module": "first-root", "children": [somechildren] } }
but what if I need 1+n roots?
I've tried to create tree without first module >
state = { tree: {"children": [somechildren] } }
and in the renderNode function added
if (!node.module) { return null; }
renders fine, but now draggable element has padding(shifted), because root doesn't contain node.
Need structure example:
state = { tree: [ { "module": "first-root", "children": [somechildren]}, { "module": "second-root", "children":[somechildren]}, etc. ]}

[maebert]

Possibly related to #68