Observe Multiple Selections of Viewers

Thanks to Peter Centgraf and Boris we now have the ability to observe multiple selections in Viewers. To take it for a test drive check out org.eclipse.jface.databinding from HEAD and take a look at ViewersObservables.observeMultiSelection(ISelectionProvider selectionProvider). Technically you can observe the selection of any ISelectionProvider with the API, not just Viewers.

bug 124683