BI-110963 fix: IconCombo支持隐藏tigger图标

src/case/combo/iconcombo/combo.icon.js

@@ -42,7 +42,8 @@ BI.IconCombo = BI.inherit(BI.Widget, {
             height: o.height,
             iconWidth: o.iconWidth,
             iconHeight: o.iconHeight,
-            value: o.value
+            value: o.value,
+            isShowDown: o.isShowDown
         });
         this.popup = BI.createWidget(o.popup, {
             type: "bi.icon_combo_popup",