Collections dialog is sometimes invisble
Steps to recreate:
- Add multiple books to Gnome Books
- Right-click and then select all books
- Click "Collections" button
Expected behaviour:
- Gnome Books opens the Collections dialog quite quickly, centred on the main window
Actual behaviour:
- The dialog appears to be opened centred on the monitor, but is invisible
- The dialog can still be interacted with (create collections, add to collections, close) but you're poking blind