Make an "unerase" feature in gallery mode

[Raphael-Boichot]

This mode would enable scanning all the images, even erased and allow to unerase one. Additionnally, this mode would allow definitive erasing too (rewrite with white tiles).

[HerrZatacke]

I think restore all images and delete all images options should be enough (no selective restore) for ease of implementation. Also: order of images can not be restored.

[Raphael-Boichot]

Great like you propose !