R1:9790f93a835e

Show all packages with a claim on a file in the table of contents view

Summary:
Ref T9218. See discussion there for rationale; I think this is the right behavior to pursue.

The screenshot below is pretty ugly. I think it's a lot worse than most real-world cases will be, since you have to sort of opt-in to having crazy levels of overlapping packages, and it's perfectly normal/reasonable for files owned by one package. Owners is powerful enough to let you specify sub-packages with exclusive ownership.