Index: trunk/src/org/openstreetmap/josm/actions/FollowLineAction.java
===================================================================
--- trunk/src/org/openstreetmap/josm/actions/FollowLineAction.java	(revision 4213)
+++ trunk/src/org/openstreetmap/josm/actions/FollowLineAction.java	(revision 4214)
@@ -121,4 +121,9 @@
                 osmLayer.data.addSelected(newFollower);
                 osmLayer.data.addSelected(newPoint);
+                // "viewport following" mode for tracing long features 
+                // from aerial imagery or GPS tracks. 
+                if (Main.map.mapView.viewportFollowing) {
+                    Main.map.mapView.smoothScrollTo(newPoint.getEastNorth());
+                };
                 return;
             }