Blender Git Loki

Fix T65263: Outliner doesn't display selected object if parent not selected

This works for most situations, however if you have:

```
A
|-> B
|--> C
```

And only A and C are selected, C will be shown nested under A, instead
being by its side.

I still have to think on how to address these cases since they are
slightly misleading.

Related: T65263.

Reviewers: brecht

Differential Revision: https://developer.blender.org/D5134