Btw: Is there another handler that is called when (before) opening the context menu of the Working Files? currentDocumentChange is called every time you open another doc and maybe it isn't even called when you re-organize your Working Set order or do something similar. So it would be cool if there's another handler.

Assigning to @JeffryBooher

Nominating for Sprint 35

Looks good...Merging

I forgot about this PR, but in the meantime I found #5952. I won't say any of these is better or worse, but a difference worth mentioning is using $(workingSetCmenu).on("beforeContextMenuOpen") instead of currentDocumentChange.
I'll just create another PR to get this change in.