REPORT-74080 fix: 删除 iconGap 默认的水平间距

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

@@ -24,7 +24,7 @@
             if (isVertical(props.iconPosition)) {
                 // 图标高度和文字高度默认相等
                 adaptiveHeight += (props.textHeight || 16) * 2;
-                adaptiveHeight += props.iconGap || 4;
+                adaptiveHeight += props.iconGap || 0;
                 var tGap = props.tgap || props.vgap || 2;
                 var bGap = props.bgap || props.vgap || 2;
                 adaptiveHeight += (tGap + bGap);
@@ -58,7 +58,7 @@
                 bgap: 0,
                 lgap: 0,
                 rgap: 0,
-                iconGap: 4,
+                iconGap: 0,
                 iconPosition: "left"
             });
         },