Drawing a simple line, artifact on screen (probably me doing something wrong...)

Yes, I first delete it and then create it (currently I’m not worried about efficiency, just trying to get a grip on the workings…)
I know I could just move it instead
Another thing, this only happens if I have some text to the extreme left of the screen, if I move that further away from the edge, this does not happen! So it seems to be something related to scroll again :slight_smile: