In [this job](https://travis-ci.org/jaraco/cmdix/jobs/491246158), a project is using assertEqual to compare two directory listings that don't match in the group. But the hint markers pointing to the mismatch are pointing at positions that match:

E       AssertionError: '--w-[50 chars]drwxrwxr-x 2 2000  2000    4096 2019-02-10 14:[58 chars]oo\n' != '--w-[50 chars]drwxr-xr-x 2 2000  2000    4096 2019-02-10 14:[58 chars]oo\n'
E         --w-r---wx 1 2000  2000  999999 2019-02-10 14:02 bar
E       - drwxrwxr-x 2 2000  2000    4096 2019-02-10 14:02 biz
E       ?  ---
E       + drwxr-xr-x 2 2000  2000    4096 2019-02-10 14:02 biz
E       ?        +++
E       - -rw-rw-r-- 1 2000  2000     100 2019-02-10 14:02 foo
E       ? ---
E       + -rw-r--r-- 1 2000  2000     100 2019-02-10 14:02 foo
E       ?        +++

As you can see, it's the 'group' section of the flags that differ between the left and right comparison, but the hints point at the 'user' section for the left side and the 'world' section for the right side, even though they match.

I observed this on Python 3.7.1. I haven't delved deeper to see if the issue exists on 3.7.2 or 3.8.