History window does not show full history for branched files with Perforce

1. Startup the editor with a P4 backed project, and enable a valid P4 connection
2. Create a file
3. check it in
4. make a revision.
5. Then copy it on disk, give it a new name, mark the new file for add
6. Integrate the existing file on top of it, and resolve accepting source.

History for that new file was correctly displayed in P4, but the editor does not show the revision history in the history window.

Alternatively, use rename asset from the content browser right click menu to branch the file to a new location, instead of the manual path with P4 operations above