Fix invalid formatting when line comment before comma

[fee1-dead]

Resolves #5784. Code may not be the best. Another way to do this might be for the list code to accept the end of list span as a parameter such that we can recover comments between the last item and the end that way, to avoid special casing the last item in the list.

[calebcartwright]

Another way to do this might be for the list code to accept the end of list span as a parameter such that we can recover comments between the last item and the end that way, to avoid special casing the last item in the list.

I like the sound of that idea. Is it something you'd have the interest/bandwidth to experiment with?

[fee1-dead]

I just came back to this and tried to make sense of it. The problem is that I can't seem to recall why I wrote that in the PR description, as I don't see an alternative for this fix. Maybe the domain specific knowledge has just been lost...