how to send a oneline patch on GitLab through web interface

1. Open file you want to edit on GitLab.
2. Wait until all JavaScript bloatware loads.
3. Find out that GitLab logged you out.
4. Press Sign in button.
5. Wait until Cloudflare checks your belonging to human race.
6. Enter credentials.
7. Wait until Cloudflare checks your belonging to human race AGAIN.
8. Edit the file.
9. Fill out PR.
10. Find out that GitLab instead of commiting your changes on top of upstream branch, committed them on top of 3 year old fork master branch, mixing-in some old and unrelated commits to the PR.
11. Remove your fork.
12. Edit the file AGAIN.
13. Fill out PR.

I know GitLab is Microsoft and therefore bad and evil but GitLab isn't any better.

Also I knew I had to do this through CLI, I thought it would be fun to do it slightly unusual way and oh boy it was. :)