Pieces are cut funny when puzzle units are rectangular

[smitt04]

If the image is rectangular I and I create a square grid i.e. 4x4 or the image is square and i choose a rectangular grid i.e. 3x5 then the left and right / top and bottom are different sizes. It would be nice to always have all sides be equal cutouts. Maybe choose the smaller of the 2 sides and use that. I tried to figure out where to do that in code but I couldn't. Also if top and bottom are both inset then they tend to overlap. I attached some samples.

[EnesKaraosman]

You need to select you row & column size respectively. (According to image's aspectRatio)