I just noticed this after uninstalling the nuclide packages (but it’s probably unrelated), and from what I can see on online screenshots, this is not how it’s supposed to look
Have a look at where the pointer is:
the pointer is on the folding toggle, but on its right there’s a lot of apparently useless and extraneous whitespace. You can even see it in line1: the highlight is missing over that column
Any idea what this might be?