What is this "line" I am seeing?

[Trying_to_learn]

With the original colour scheme, I thought I saw something and just put it down to I'm seeing things.

But now I have the new colour scheme there is definitely a line.

This one you can see 3 of these lines. (Inside the red highlighted areas.
I can kind of get the first two (left). They indicate an indent. MAYBE.
The third... Well... Can't say.

But this one only has the third one. None at the indents.

Likewise with this one.

So what is this phantom line at the right?

[dceejay]

It is the right print margin that is default in the editor at 80 characters.
It just happens to be the default in the built in Ace editor.

[Trying_to_learn]

Thanks. Good to know what is was.