Index: trunk/src/org/openstreetmap/josm/gui/layer/gpx/GpxDrawHelper.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/layer/gpx/GpxDrawHelper.java	(revision 12174)
+++ trunk/src/org/openstreetmap/josm/gui/layer/gpx/GpxDrawHelper.java	(revision 12175)
@@ -194,7 +194,5 @@
         SystemOfMeasurement som = SystemOfMeasurement.getSystemOfMeasurement();
         velocityScale.addTitle(tr("Velocity, {0}", som.speedName));
-        if (oldSoM != null && newSoM != null && Main.isDisplayingMapView()) {
-            Main.map.mapView.repaint();
-        }
+        layer.invalidate();
     }