preventing from bleeding into other dnd-sorts on the same page

javascript/src/DragAndDrop.js

@@ -26,6 +26,7 @@ var QfqNS = QfqNS || {};
         this.eventEmitter = new EventEmitter();
         this.dropZones = [];
         this.elements = [];
+        this.active = false;
         this.api = $hook.data("dnd-api");
         this.draggedId = "";
         this.lastChild = "";
@@ -195,13 +196,16 @@ var QfqNS = QfqNS || {};
             child.on("dragstart", function(e) {
                 e.originalEvent.dataTransfer.setData("text", child[0].id);
                 that.draggedId = child[0].id;
+                that.active = true;
                 e.originalEvent.dataTransfer.effectAllowed = "move";
             });
             child.on("dragenter", function(e) {
-
-                that._buildOrderDropZones($(this), e);
+                if (that.active) {
+                    that._buildOrderDropZones($(this), e);
+                }
             });
             child.on("dragend", function() {
+                that.active = false;
                 that.removeDropAreas();
             });
         });