Track ghostly inlines across file moves
Summary:
Ref T7447. Ref T7870.
- Forward: When rendering some file "B" which was moved from "A", port ghosts for both "A" and "B" to it.
- Backward: When porting a comment on "X" which was moved from some "Y", allow it to port to a file named "Y" if it can't find a file named "X".
Test Plan:
Before:
After:
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Differential Revision: https://secure.phabricator.com/D12493