The problem is with Oct icons – due to his nature the icon in subgrid is not centered. If we center the plus icon the minus icon will not be centered and vice verso. We have do a partial fix for Octicons only.
i just downloaded and tried the lastest version on github.
It looks like everything is working now. I do not see the horizontal bar and it looks like I can’t reproduce the problem. If it happens again i will let your know.
For now I thank you very much for your time and help.