image: Rectangle.{Overlaps,Intersect} doesn't check for 1 pixel overlaps

[OneOfOne]

Overlaps and Intersect should use >= / <= for their checks.

func (r Rectangle) Overlaps(s Rectangle) bool {
    return r.Min.X <= s.Max.X && s.Min.X <= r.Max.X &&
        r.Min.Y <= s.Max.Y && s.Min.Y <= r.Max.Y
}

instead of 

func (r Rectangle) Overlaps(s Rectangle) bool {
    return r.Min.X < s.Max.X && s.Min.X < r.Max.X &&
        r.Min.Y < s.Max.Y && s.Min.Y < r.Max.Y
}

[ianlancetaylor]

Comment 1:

Labels changed: added repo-main, release-none.

[nigeltao]

Comment 2:

As the documentation at http://golang.org/pkg/image/#Rectangle says, a Rectangle is
inclusive (<=) on the Min end but exclusive (<) on the Max end. Overlaps should
use < and not <=.

Status changed to WorkingAsIntended.