Problem: Can't use a blockwise selection with a width for getregion().
Solution: Add support for blockwise selection with width like the return
value of getregtype() or the "regtype" value of TextYankPost
(zeertzjq).
closes: #14842
Signed-off-by: zeertzjq <zeertzjq@outlook.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>