class org.eclipse.jface.viewers.Viewer (implements org.eclipse.jface.viewers.IInputSelectionProvider)
class org.eclipse.jface.viewers.ContentViewer
class org.eclipse.compare.contentmergeviewer.ContentMergeViewer (implements org.eclipse.compare.IPropertyChangeNotifier, org.eclipse.compare.internal.ISavable)
class org.eclipse.compare.contentmergeviewer.TextMergeViewer