As a note why I close this request just partially satistying it. The package lxshortcut is in fact not required anymore, yes, and it is virtual. But for lxsession-edit and lxpolkit that is not completely true because those applications can be used standalone and therefore those applications will be in separated packages on future uploads. Removing them now but adding later is not much sensible I believe and it doen't hurt to have them now in dependencies because packages still exist but are virtual for now.
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