From e2b7d54c3555f49b249114cf10e0e5b055099c86 Mon Sep 17 00:00:00 2001
From: Young <young@finereport.com>
Date: Fri, 24 May 2019 13:51:58 +0800
Subject: [PATCH] =?UTF-8?q?BI-45290=20fix:=20=E7=BB=84=E4=BB=B61=E6=BB=9A?=
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---
 src/core/wrapper/layout.js | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/core/wrapper/layout.js b/src/core/wrapper/layout.js
index 568bd4299..66b15a658 100644
--- a/src/core/wrapper/layout.js
+++ b/src/core/wrapper/layout.js
@@ -299,16 +299,22 @@ BI.Layout = BI.inherit(BI.Widget, {
     addItems: function (items, context) {
         var self = this, o = this.options;
         var fragment = BI.Widget._renderEngine.createFragment();
+        var wrapper = this._getWrapper();
         var added = [];
         BI.each(items, function (i, item) {
             var w = self._addElement(o.items.length, item, context);
             self._children[self._getChildName(o.items.length)] = w;
             o.items.push(item);
             added.push(w);
-            fragment.appendChild(w.element[0]);
+            var node = w.element[0];
+            var childNodes = wrapper[0].childNodes;
+            // BI-45290 wrapper中已包含的node不需要再次添加（添加可能导致内部滚动条位置重置）
+            if (!BI.contains(childNodes, node)) {
+                fragment.appendChild(node);
+            }
         });
         if (this._isMounted) {
-            this._getWrapper().append(fragment);
+            wrapper.append(fragment);
             BI.each(added, function (i, w) {
                 w._mount();
             });
@@ -605,4 +611,4 @@ BI.Layout = BI.inherit(BI.Widget, {
 
     }
 });
-BI.shortcut("bi.layout", BI.Layout);
\ No newline at end of file
+BI.shortcut("bi.layout", BI.Layout);