Couldn't find anything on this by searching, so hopefully it's not super obvious. Every now and then, through some accidental sequence of keys, a solid bar appears to the left of my line numbers.
I have no idea how to get rid of it. Note that this is not a result of me searching the empty string, as 'response' is the highlighted string match. It is local to the particular file, so it doesn't show up when I open other documents.
Any insight would be much appreciated.