LeaVerou/dabblet — pull request #188 by GeorgeTzellis (2012-08-24 10:24:52+00:00)
Title: Line-delimiter scrolls (#171), is unobtrusive

The line-delimiter used to remain at the same position when the editor scrolled horizontally, betraying its function.

The new line-delimiter also limits itself to the content you've written.
You can now tell when there are empty lines at the end of your input, and distinguish between 1 empty line and 10.
I think this is a good pairing with the unobtrusive design of the line-number indicator.