Indentation over line's number

Can’t explain it too well but I guess the image will do the trick:

Basically the indentation thingy there goes over the line number.
Feel free to ask for more images or explanation!

Please resubmit this bug report and make sure that: 1) you follow the bug report template, 2) you use the default theme (no css) and 3) there are no third-party plugins enabled (You can use the sandbox vault for 2 and 3).

Yeah, sorry. I was in a hurry when writing it. Anyway, It’s something related to the feature “Draw vertical indentation lines” of the outliner community plugin by Viacheslav Slinko. I temporarily resolved it disabling the feature.