patch 9.1.1175: inconsistent behaviour with exclusive selection and motion commands

patch 9.1.1175: inconsistent behaviour with exclusive selection and motion commands

Problem:  inconsistent behaviour with exclusive selection and motion
          commands (aidancz)
Solution: adjust cursor position when selection is exclusive
          (Jim Zhou)

fixes: #16278
closes: #16784

Co-authored-by: Hirohito Higashi <h.east.727@gmail.com>
Co-authored-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Jim Zhou <jimzhouzzy@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>