stretch能够根据是否有滚动条能够动态选择，而不需要主动选择

src/core/wrapper/layout/adapt/float.horizontal.js

@@ -1,5 +1,6 @@
 /**
  * 浮动的水平居中布局
  */
-BI.FloatHorizontalLayout = BI.inherit(BI.Layout);
+BI.FloatHorizontalLayout = function () {
+};
 BI.shortcut("bi.horizontal_float", BI.FloatHorizontalLayout);

src/core/wrapper/layout/layout.horizontal.js

@@ -3,5 +3,6 @@
  * @class BI.HorizontalLayout
  * @extends BI.Layout
  */
-BI.HorizontalLayout = BI.inherit(BI.Layout);
+BI.HorizontalLayout = function () {
+};
 BI.shortcut("bi.horizontal", BI.HorizontalLayout);

src/core/wrapper/layout/layout.inline.js

@@ -54,7 +54,7 @@ BI.InlineLayout = BI.inherit(BI.Layout, {
             if (o.columnSize[i] === "fill") {
                 w.element.css("min-width", "calc(100% - " + ((left + right) / BI.pixRatio + BI.pixUnit) + ")");
             }
-            if (o.horizontalAlign === BI.HorizontalAlign.Stretch) {
+            if (o.horizontalAlign === BI.HorizontalAlign.Stretch || !(o.scrollable === true || o.scrollx === true)) {
                 w.element.css("max-width", "calc(100% - " + ((left + right) / BI.pixRatio + BI.pixUnit) + ")");
             }
         }