+import jalview.datamodel.ColumnSelection;
+import jalview.datamodel.SequenceGroup;
+import jalview.util.MessageManager;
+
+import java.awt.Color;
+import java.awt.FontMetrics;
+import java.awt.Graphics;
+import java.awt.MenuItem;
+import java.awt.Panel;
+import java.awt.PopupMenu;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+import java.awt.event.InputEvent;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.awt.event.MouseMotionListener;