Ghost document doubled in favourites after removing higher-order favourite

[almereyda]

Hi! The title is more complex, than what this is:

1. Having one document in the favourites, I decide to add the higher-order parent of it to them, too!

2. What we are finding, is what we expect.

3. The case of removing the higher-order parent leaves it's children in multiple places, at once.

The artefact dissapears after reloading.