bug of (meow-line -1)

[jixiuf]

if the selection is like the following (M: mark, P: point)

M.................
....................
.............P

negative-argument + meow-line
should become:

M.................
....................P
.............

but got

M.................
P....................
.............

[DogLooksGood]

I think it should become

P............... Add one more line in the beginning
.................
....................
.............M

According to the rules.
As meow-line create an expandable selection which should be expanded when meet the same command.

Current behavior is wrong, but it should be fixed in a different way from PR #564