It would be convenient to know from which lister (or sourcetab & desttab) the new OnAddButtons method is "called from".
My current use case is that I want to build some menu which depends on vars stored at the tab level. So I do need to get the lister.
I guess I could try and reach from DOpus.listers.lastactive, but 1) I'm not 100% sure it's equivalent (common sense says it is though 
), 2) it would seem more obvious (a bit like the func object in the ScriptCommandData gives access to sourcetab/desttab).
Could you confirm DOpus.listers.lastactive would be equivalent?
If yes, no rush then to consider wether to extend the AddButtonsData properties or not.