From c17325650df306558bf04ffb530ede108b9278ef Mon Sep 17 00:00:00 2001
From: Chris Ribal <chris.ribal@gmail.com>
Date: Fri, 2 Nov 2018 14:08:30 +0100
Subject: [PATCH] Fixed drag & drop bug in IE 11

On drag start's dataTransfer store, the setData() function only accepts a string as second arguments, according to https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer/setData

While modern browsers stringify the null data type to "null" string value, drag & drop breaks in IE 11 when passing null to e.dataTranser.setData('text', null)
---
 src/tree.vue | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/tree.vue b/src/tree.vue
index 5896481..e0f4f6f 100644
--- a/src/tree.vue
+++ b/src/tree.vue
@@ -235,7 +235,7 @@
                 if (!this.draggable || oriItem.dragDisabled)
                     return false
                 e.dataTransfer.effectAllowed = "move"
-                e.dataTransfer.setData('text', null)
+                e.dataTransfer.setData('text', '')
                 this.draggedElm = e.target
                 this.draggedItem = {
                     item: oriItem,