I've tried this on Paint and Paint.net. There's got to be a way but I can't figure it out.
On Paint I just learned this isn't possible. So, on Paint.net, what if select a portion but want to pull the right side of the square in a little? Whenever I do that it cuts out the picture and I don't understand I want to select a part of a photo to crop. Then before I actually crop it, I wanted to tinker with the exact spots of the lines in the square.
How do I do that?