Code review comment for lp:~ubuntu-sdk-team/ubuntu-ui-toolkit/outTheWindow

> Why do you derive from PageTreeNode?
An oversight indeed. Thanks for noticing.

> For now this is OK. But in general, as next step, the window should have its own units instance
Between said discussion and now the goal seems to have changed from starting with a proof of concept to having a full implementation including tests - fine by me, I was starting to think about it as well, but just to point out that this is changing the plan :-D