Add constraint to prevent user from resize out of image
Add constraint to prevent user from resize out of image

Tried to remove check if pos < 0 or pos + size of cropregion > size of image
but it is still possible to resize about 3px out of the window and
I didn't found how to solve this bug by now so the old check is still needed

koala-framework/koala-framework,Ben-Ho/koala-framework,yacon/koala-framework,Sogl/koala-framework,nsams/koala-framework,nsams/koala-framework,yacon/koala-framework,kaufmo/koala-framework,koala-framework/koala-framework,kaufmo/koala-framework,Ben-Ho/koala-framework,yacon/koala-framework,nsams/koala-framework,darimpulso/koala-framework,kaufmo/koala-framework,Sogl/koala-framework,darimpulso/koala-framework