BI-72808 fix:IE11，文本组件下拉选项面板被分组表遮挡，显示不清

src/less/widget/downlist/combo.downlist.less

@@ -1,5 +1,9 @@
 @import "../../index";
 
 .bi-down-list-combo {
-
+    &.hack {
+        .bi-popup-view {
+            position: -ms-page !important;
+        }
+    }
 }

src/widget/downlist/combo.downlist.js

@@ -4,7 +4,7 @@
 BI.DownListCombo = BI.inherit(BI.Widget, {
     _defaultConfig: function () {
         return BI.extend(BI.DownListCombo.superclass._defaultConfig.apply(this, arguments), {
-            baseCls: "bi-down-list-combo",
+            baseCls: "bi-down-list-combo" + (BI.isIE() ? " hack" : ""),
             height: 24,
             items: [],
             adjustLength: 0,