In our current situation, very often I need to display the current Selection in the screen, so I use @Selection function in a general manner.
In some other cases I want to display a specific one, so I use the @Entity.
However sometimes I need to display the selection for a given tree (that can have 30 entities in it) but I don't want to display all other selections on "technical" entities. I don't want to put all 30 @Entity otherwise I will have something unreadable.
Idea: provide a substitution formula for @Selection_Tree(Entity) that will act like @Selection but within a given tree.