less duplicate code

src/Util/YEvent.js

@@ -31,24 +31,6 @@ export default class YEvent {
    *   type === event.target // => true
    */
   get path () {
-    const path = []
-    let type = this.target
-    const y = type._y
-    while (type !== this.currentTarget && type !== y) {
-      let parent = type._parent
-      if (type._parentSub !== null) {
-        path.unshift(type._parentSub)
-      } else {
-        // parent is array-ish
-        for (let [i, child] of parent) {
-          if (child === type) {
-            path.unshift(i)
-            break
-          }
-        }
-      }
-      type = parent
-    }
-    return path
+    return this.currentTarget.getPathTo(this.target)
   }
 }