DESIGN-4069 fix: button 的 setIcon 不使用 IconChangeButton

src/base/single/button/buttons/button.js

@@ -77,8 +77,8 @@
             }
             if (BI.isKey(o.iconCls)) {
                 this.icon = BI.createWidget({
-                    type: "bi.icon_change_button",
-                    iconCls: o.iconCls,
+                    type: "bi.icon_label",
+                    cls: o.iconCls,
                     width: this._const.iconWidth,
                     height: lineHeight,
                     lineHeight: lineHeight
@@ -195,10 +195,11 @@
             }
         },
 
-        setIcon: function (iconCls) {
-            if (this.icon) {
-                this.options.iconCls = iconCls;
-                this.icon.setIcon(iconCls);
+        setIcon: function (cls) {
+            var o = this.options;
+            if(this.icon && o.iconCls !== cls) {
+                this.icon.element.removeClass(o.iconCls).addClass(cls);
+                o.iconCls = cls;
             }
         },