Incorrect line length when using "vertical grid grouped" mode.

[alvassin]

Assume we have two files a.py and b.py: a.py

FIRST_______________________________ = 1
SECOND______________________________ = 2
THIRD = 3

b.py

from a import FIRST_______________________________
from a import SECOND______________________________
from a import THIRD

After i run isort -l 79 -m 5 b.py i see that line exceeds given limit (i use latest 5.10.1 version):

from a import (
    FIRST_______________________________, SECOND______________________________,
    THIRD
)

Could you please help?

[DanielNoord]

How does this exceed the limit? Isn't it exactly at 79?