apply fit() to all rows, even when they are not complete to fix the misalignment ref #16576

[GretaD]

fix #554

[juliushaertl]

Test failures unrelated

[nickvergessen]

The gallery app has been replaced by the beautiful new app: Nextcloud Photos - :camera_flash: Your memories under your control

Please checkout if your Pull request is still necessary there, and in case create it there or raise an issue for others to copy the change from here.