Merge pull request #122591 in DEC/fineui from master to feature/x

* commit '969e9011d3efb7d7926b4637c73ac6bc7421cdb8':
  BI-110672 fix: 修复loading的时候丢失上下文的问题

src/base/1.pane.js

@@ -40,10 +40,10 @@ BI.Pane = BI.inherit(BI.Widget, {
 
     loading: function () {
         var self = this, o = this.options;
-        var loadingAnimation = BI.Providers.getProvider("bi.provider.system").getLoading({ 
+        var loadingAnimation = BI.createWidget(BI.Providers.getProvider("bi.provider.system").getLoading({ 
             loadingSize: o.loadingSize,
             context: this
-        });
+        }));
         // pane在同步方式下由items决定tipText的显示与否
         // loading的异步情况下由loaded后对面板的populate的时机决定
         this.setTipVisible(false);