To reproduce:
1. Activate tagging (View > Tags > Show tag box)
2. Tag a file by clicking on the checkbox shown in the top left corner of the thumbnail.
3. Open the file with "Tools > Open".
4. Switch to fullscreen with "View > Fullscreen"
--> The tag box is not checked

5. Press "T" to tag the current image
--> The tag box is still not checked
