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I think algorithm in stereoBM is

looks for pixel (xr,y) best matches pixel(xl,y) in left image with xl ranging to xr+minDisparity and xr+minDisparity +numOfdisparities.

Hence if [xr+minDisparity ,xr+minDisparity +numOfdisparities] is outside of images don't try to match pixel because you cannot find the best with given constraint.

I think algorithm in stereoBM is

looks for pixel (xr,y) best matches pixel(xl,y) in left image with xl ranging to xr+minDisparity and xr+minDisparity +numOfdisparities.

Hence if [xr+minDisparity ,xr+minDisparity +numOfdisparities] is outside of images don't try to match pixel because you cannot find the best with given constraint.

I think algorithm in stereoBM is

looks for pixel (xr,y) best matches pixel(xl,y) in left image with xl ranging to xr+minDisparity and xr+minDisparity +numOfdisparities.

Hence if [xr+minDisparity ,xr+minDisparity +numOfdisparities] is outside of images don't try to match pixel because you cannot find the best with given constraint.

In stereoBM I think limt limits are defined and used here