improve and customize line-mouse-marker:

- negative zIndexOffset to have line marker under waypoint markers
- turn line marker off when over waypoint marker
- consider border width in iconAnchor (fix offset from line)
- same border color and width as line (instead of black)

js/plugin/Routing.js

@@ -8,12 +8,23 @@ BR.Routing = L.Routing.extend({
             */
             draw: false
         },
-        snapping: null
+        snapping: null,
+        zIndexOffset: -2000
     },
 
     onAdd: function (map) {
         var container = L.Routing.prototype.onAdd.call(this, map);
 
+        // turn line mouse marker off while over waypoint marker
+        this.on('waypoint:mouseover', this._edit._segmentOnMouseout, this._edit);
+        this.on('waypoint:mouseout', this._edit._segmentOnMouseover, this._edit);
+
+        this._edit._mouseMarker.setIcon(L.divIcon({
+          className: 'line-mouse-marker'
+          ,iconAnchor: [8, 8] // size/2 + border/2
+          ,iconSize: [8, 8]
+        }));
+
         this._draw.on('enabled', function() {
             // crosshair cursor
             L.DomUtil.addClass(map.getContainer(), 'routing-draw-enabled');