Annotation with Perforce doesn't take into account individual-file branching

If I have a file named FileA which was created by UserA, and then UserB integrates FileA to FileB and deletes FileA, all lines in FileB will show up as authored by UserB. This flows through to aggregate line counts and everything else.

As UserA:

p4 add FileA
p4 submit
p4 annotate FileA <-- Shows all lines owned by UserA
view FileA in FishEye <-- Shows all lines owned by UserA

As UserB:

p4 integ FileA FileB
p4 delete FileA
p4 submit
p4 annotate FileB <-- Shows all lines still owned by UserA
view FileB in FishEye <-- Shows all lines owned by UserB

Note that the same operation (p4 annotate) in p4 command-line or in p4v does not suffer from this, and detects when individual lines were originally authored by UserA, but UserB just changed the name of the file (or even changed the file name and changed 3 lines: only those 3 lines will show up as authored by UserB, rather than the whole file).