I’ve implemented cropping in the pipeline and connected it with the UI.
No database yet, so the crops aren’t saved anywhere.
But more importantly, there are off-by-one errors that I have to hammer out, and if the image is resized to be too small (at least for extremely skinny aspect ratios like 4000x1 pixels) the thumbnail writing crashes and the image in question cannot be reopened. I have to do something about these.