+import jalview.datamodel.Sequence;
+import jalview.datamodel.SequenceFeature;
+import jalview.datamodel.SequenceGroup;
+import jalview.datamodel.SequenceI;
+import jalview.urls.api.UrlProviderFactoryI;
+import jalview.urls.api.UrlProviderI;
+import jalview.urls.applet.AppletUrlProviderFactory;
+import jalview.viewmodel.AlignmentViewport;
+
+import java.awt.BorderLayout;
+import java.awt.Panel;
+import java.awt.event.InputEvent;
+import java.awt.event.MouseEvent;
+import java.awt.event.MouseListener;
+import java.awt.event.MouseMotionListener;
+import java.util.ArrayList;
+import java.util.HashMap;