Notifications should appear in the top layer, above even modal dialogs, like they do with OOUI dialogs. However they appear below MMV dialogs. This was observed in T312770 where the "Copied/Not copied" notification is hidden.
- Open an image with MMV
- Trigger a notification by opening the share/reuse module and clicking the copy button
- Expected: You see a notification
- Observed: You don't see a notification
