+import jalview.commands.CommandI;
+import jalview.commands.EditCommand;
+import jalview.commands.EditCommand.Action;
+import jalview.datamodel.AlignmentI;
+import jalview.datamodel.SequenceGroup;
+import jalview.datamodel.SequenceI;
+import jalview.util.MessageManager;
+
+import java.awt.Frame;
+import java.awt.event.ActionEvent;
+import java.awt.event.AdjustmentEvent;
+import java.awt.event.AdjustmentListener;
+import java.awt.event.WindowEvent;
+import java.awt.event.WindowListener;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Stack;
+import java.util.Vector;