fix event.path by using event.currentTarget

src/Util/YEvent.js

@@ -2,32 +2,27 @@
 export default class YEvent {
   constructor (target) {
     this.target = target
-    this._path = null
+    this.currentTarget = target
   }
   get path () {
-    if (this._path !== null) {
-      return this._path
-    } else {
-      const path = []
-      let type = this.target
-      const y = type._y
-      while (type._parent !== y) {
-        let parent = type._parent
-        if (type._parentSub !== null) {
-          path.push(type._parentSub)
-        } else {
-          // parent is array-ish
-          for (let [i, child] of parent) {
-            if (child === type) {
-              path.push(i)
-              break
-            }
+    const path = []
+    let type = this.target
+    const y = type._y
+    while (type._parent !== this._currentTarget && type._parent !== y) {
+      let parent = type._parent
+      if (type._parentSub !== null) {
+        path.push(type._parentSub)
+      } else {
+        // parent is array-ish
+        for (let [i, child] of parent) {
+          if (child === type) {
+            path.push(i)
+            break
           }
         }
-        type = parent
       }
-      this._path = path
-      return path
+      type = parent
     }
+    return path
   }
 }