fix for scale when selecting reference sequence

git-svn-id: svn+ssh://svn.internal.sanger.ac.uk/repos/svn/pathsoft/artemis/trunk@13857 ee4ac58c-ac51-4696-9907-e4b3aa274f04

uk/ac/sanger/artemis/components/alignment/BamView.java

@@ -1828,6 +1828,10 @@ public class BamView extends JPanel
       {
         laststart = -1;
         lastend = -1;
+        
+        if(feature_display != null)
+          setZoomLevel(feature_display.getMaxVisibleBases());
+        else
           setZoomLevel(BamView.this.nbasesInView);
       }
     });