Photos: Duplicate thumbnails are generated after viewing photo.

[joutwate]

Describe the bug
After viewing the last photo in a list of photos, duplicate thumbnails are generated for some photos.

To Reproduce

1. Go to try.nextcloud.com
2. Select the 'Photos' button on the upper toolbar
3. Note the number of thumbnails shown (screenshot attached shows 9, using demo instance from try.nextcloud.com)
4. Click to view the full version of the last photo displayed (the little bird)
5. Close the view of the full photo
6. Note the number of photo thumbnails and duplicates now shown (screenshot attached shows 16, using demo instance from try.nextcloud.com)

Expected behavior
After viewing a photo in the web based app, the original set of photo thumbnails should be shown.

Screenshots

Desktop (please complete the following information):

• OS: Linux Mint
• Browser: Chrome
• Version: 87.0.4280.66

Browser log

demo1.nextcloud.com-1606451208394.log

Additional context
All reproducible on try.nextcloud.com

[skjnldsv]

Hey :)

Duplicate of https://github.com/nextcloud/photos/issues/404

[joutwate]

Hey :)

Duplicate of #404

Thanks. I'll be better about searching for duplicates moving forward.