fix v-on patching for cloned slot nodes (fix vuejs#3556)

yyx990803 · yyx990803 · commit 32971d85884b · 2016-08-29T18:45:07.000-04:00
diff --git a/src/core/vdom/helpers.js b/src/core/vdom/helpers.js
@@ -104,13 +104,15 @@ export function updateListeners (
         }
         add(event, cur.invoker, capture)
       }
-    } else if (Array.isArray(old)) {
-      old.length = cur.length
-      for (let i = 0; i < old.length; i++) old[i] = cur[i]
-      on[name] = old
-    } else {
-      old.fn = cur
-      on[name] = old
+    } else if (cur !== old) {
+      if (Array.isArray(old)) {
+        old.length = cur.length
+        for (let i = 0; i < old.length; i++) old[i] = cur[i]
+        on[name] = old
+      } else {
+        old.fn = cur
+        on[name] = old
+      }
     }
   }
   for (name in oldOn) {

Original file line number	Diff line number	Diff line change
`@@ -104,13 +104,15 @@ export function updateListeners (`
`104`	`104`	`}`
`105`	`105`	`add(event, cur.invoker, capture)`
`106`	`106`	`}`
`107`		`- } else if (Array.isArray(old)) {`
`108`		`- old.length = cur.length`
`109`		`- for (let i = 0; i < old.length; i++) old[i] = cur[i]`
`110`		`- on[name] = old`
`111`		`- } else {`
`112`		`- old.fn = cur`
`113`		`- on[name] = old`
	`107`	`+ } else if (cur !== old) {`
	`108`	`+ if (Array.isArray(old)) {`
	`109`	`+ old.length = cur.length`
	`110`	`+ for (let i = 0; i < old.length; i++) old[i] = cur[i]`
	`111`	`+ on[name] = old`
	`112`	`+ } else {`
	`113`	`+ old.fn = cur`
	`114`	`+ on[name] = old`
	`115`	`+ }`
`114`	`116`	`}`
`115`	`117`	`}`
`116`	`118`	`for (name in oldOn) {`