I posted a question about this before, but upgrading from 7.0R6 to 7.0 seemed to fix it. But, it turns out there were still a few spurious red lines that won't go away.
I haven't seen a recurrence of the superfluous red lines in the editor due to jar updates, but right now I have an error in the editor where it says "Cannot resolve symbol" for a class that exists in the same package and same directory in the same project.
In particular, the class com.ign.pxed.editInstance.client.EditInstance is unable to see (in the editor) the class com.ign.pxed.editInstance.client.EditSelfContainedInstance
It builds and runs fine. I tried deleting the system directory, the target directories, and doing a full rebuild. Nothing has fixed the issue. I haven't tried recreating the project files yet.
What should I delete or rebuild to make this go away?