Stick to image boundaries while cropping

[mainrs]

Is your feature request related to a problem? Please describe.
Currently, when cropping an image, one can drag the cropping indicator out of the image bounds.

Describe the solution you'd like
Allow one to set an option to make the handles stick to the image boundary and not extend them.

Describe alternatives you've considered
For me at least it makes cropping some what harder. It just feels unnatural.

[T8RIN]

I'm using lib, but there was a feature idea to create a separate crop with another lib