draw_way only applies to currently selected way

js/id/behavior/drag.js

@@ -22,7 +22,8 @@ iD.behavior.drag = function () {
 
     var event = d3.dispatch("start", "move", "end"),
         origin = null,
-        selector = '';
+        selector = '',
+        filter = null;
 
     event.of = function(thiz, argumentz) {
       return function(e1) {
@@ -119,7 +120,8 @@ iD.behavior.drag = function () {
                 var root = this,
                     target = d3.event.target;
                 for (; target && target !== root; target = target.parentNode) {
-                    if (target[matchesSelector](selector)) {
+                    if (target[matchesSelector](selector) &&
+                            (!filter || filter(target.__data__))) {
                         return mousedown.call(target, target.__data__);
                     }
                 }
@@ -141,6 +143,12 @@ iD.behavior.drag = function () {
         return drag;
     };
 
+    drag.filter = function(_) {
+        if (!arguments.length) return origin;
+        filter = _;
+        return drag;
+    };
+
     drag.origin = function (_) {
         if (!arguments.length) return origin;
         origin = _;

js/id/behavior/drag_way.js

@@ -4,6 +4,9 @@ iD.behavior.DragWay = function(mode) {
 
     return iD.behavior.drag()
         .delegate('.casing, .stroke, .area')
+        .filter(function(d) {
+            return d && d.id === mode.entity.id;
+        })
         .origin(function(entity) {
             return projection(entity.nodes[0].loc);
         })