"By date" collapses when deleting all photos in view

[SimonLundberg]

The "by date" tree menu in the photos panel collapses automatically in some situations, such as this:

1.  Browse to a specific day. For best results, use a date old enough to require you to click "view all".
2.  Mark a photo as rejected. 
3.  Turn on a filter to only show rejected photos. 
4.  Select all photos in the grid view and delete them. This causes the "by date" tree to collapse.

[SimonLundberg]

When duplicating a photo, the "by date" tree menu thing on the left collapses automatically. 

Steps to reproduce:

1.  Browse to photos on a specific day via the "by date" thing in the photo browser. For best results, use an old date that you need to click "view all" to see.
2.  Right-click on a photo and duplicate it. The "by date" collapses.