What are these "phantom comments" at the end of statements in Dart called, so I can turn them off?

I just upgraded to 2017.3.1 CE, and I am now seeing these extra comments in my code that only appear in the IDE, and aren't deletable or selectable.  I assume they are some kind of indicator meant to be helpful, but to me they are just annoying: I keep thinking there are extra comments in my code that I would not want to put there (see "// argParser.addOption" comment in the image below: I didn't type that, and it doesn't appear on disk in the file).

If I knew what the heck they were called, I might be able to find an option to turn them off (which I really hope exists!).  I might not mind them if they were really dim and NOT formatted exactly like real comments, but as they are they are really confusing.  I've tried searching the preferences, Google, and this site, but I'm clearly not using the right terms.

This is in a Dart file, so perhaps it's related to the Dart plugin, but I don't see any options there either.