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Workspaces are gone. But topComponent sets are comming (for more it will be possible to read in UI spec).
There is a class TopComponentSet introduced (together with its model). Also config classes are defined (for interaction with persistence). There are needed to specify methods for manipulation yet (i.e. retrieving of set, opening, closing etc.).
Forgot to mark as fixed. (The manipulation methods are part of (inner)API definition).