(Disclaimer: But I really don’t know, it’s just a guess).

Having lifted that code from someone else and incorporated my vertical “highlight” all into that plugin - I can safely say “I really don’t know, it’s just a guess” as well :-) !!!

Cheers.

I use the plugin that @PeterJones mentions, but it is often of limited usefulness due to the issue discussed HERE.

Sure, it’s OK for short lines, but when you get far out to the right (e.g. columns maybe 100+), the ruler isn’t the best.

I don’t think it is the fault of the ruler functionality itself, but rather is bound up in how the characters are shown in the edit window. (Disclaimer: But I really don’t know, it’s just a guess).

Plugins > Plugins Admin, install “ColumnTools”; then Plugins > Column Tools > Ruler to enable