-import jalview.datamodel.ColumnSelection;
-import jalview.datamodel.HiddenColumns;
-import jalview.datamodel.SequenceGroup;
-import jalview.datamodel.SequenceI;
-import jalview.renderer.ScaleRenderer;
-import jalview.renderer.ScaleRenderer.ScaleMark;
-import jalview.util.MessageManager;
-import jalview.util.Platform;
-import jalview.viewmodel.ViewportListenerI;
-import jalview.viewmodel.ViewportRanges;
-