I'm running on Ubuntu 18.04
When I scroll or jump in the main text editor, the scroll bar (on the left) leaves copies of itself. This ends up resulting in eventually the entire "bar area" (not sure what to call it? The area in which the scroll bar may scroll) seems to be the scroll bar. (see here: https://i.imgur.com/HAMRZJ4.png)
More specifically, this occurs after: opening a file in a new tab, switching tabs, switching back to previous file.