04-21-2019, 09:01 PM
The real good tool to crop is the Crop tool.
I can reproduce your problem with a feathered selection. I assume that "Crop to selection" is really keeping all the pixels that are selected or partially selected. Keep in mind that the ants are not the limit of the selected pixels, but the "50% selection" line. Pixels inside are more than half-selected, pixels outside are less than half-selected. With a "sharp" selection this is the same as the border between selected and not selected, but with a oft/feathered selection this is no longer true.
I can reproduce your problem with a feathered selection. I assume that "Crop to selection" is really keeping all the pixels that are selected or partially selected. Keep in mind that the ants are not the limit of the selected pixels, but the "50% selection" line. Pixels inside are more than half-selected, pixels outside are less than half-selected. With a "sharp" selection this is the same as the border between selected and not selected, but with a oft/feathered selection this is no longer true.