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/flex/flex.horizontal.js

@@ -40,15 +40,18 @@ BI.FlexHorizontalLayout = BI.inherit(BI.Layout, {
         w.element.css({
             position: "relative"
         });
+        if (o.columnSize[i] !== "auto") {
             if (o.columnSize[i] === "fill" || o.columnSize[i] === "") {
                 if (o.horizontalAlign !== BI.HorizontalAlign.Stretch) {
                     if (o.scrollable === true || o.scrollx === true) {
                         w.element.addClass("f-s-n");
                     }
                 }
+            } else {
+                w.element.addClass("f-s-n");
+            }
         }
         if (o.columnSize[i] > 0) {
-            w.element.addClass("f-s-n");
             w.element.width(o.columnSize[i] === "" ? "" : (o.columnSize[i] <= 1 ? ((o.columnSize[i] * 100).toFixed(1) + "%") : (o.columnSize[i] / BI.pixRatio + BI.pixUnit)));
         }
         if (o.columnSize[i] === "fill") {

src/core/wrapper/layout/flex/flex.vertical.js

@@ -39,15 +39,18 @@ BI.FlexVerticalLayout = BI.inherit(BI.Layout, {
         w.element.css({
             position: "relative"
         });
+        if (o.columnSize[i] !== "auto") {
             if (o.rowSize[i] === "fill" || o.rowSize[i] === "") {
                 if (o.verticalAlign !== BI.VerticalAlign.Stretch) {
                     if (o.scrollable === true || o.scrolly === true) {
                         w.element.addClass("f-s-n");
                     }
                 }
+            } else {
+                w.element.addClass("f-s-n");
+            }
         }
         if (o.rowSize[i] > 0) {
-            w.element.addClass("f-s-n");
             w.element.height(o.rowSize[i] === "" ? "" : (o.rowSize[i] <= 1 ? ((o.rowSize[i] * 100).toFixed(1) + "%") : (o.rowSize[i] / BI.pixRatio + BI.pixUnit)));
         }
         if (o.rowSize[i] === "fill") {

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

@@ -36,15 +36,18 @@ BI.FlexWrapperHorizontalLayout = BI.inherit(BI.Layout, {
         w.element.css({
             position: "relative"
         });
+        if (o.columnSize[i] !== "auto") {
             if (o.columnSize[i] === "fill" || o.columnSize[i] === "") {
                 if (o.horizontalAlign !== BI.HorizontalAlign.Stretch) {
                     if (o.scrollable === true || o.scrollx === true) {
                         w.element.addClass("f-s-n");
                     }
                 }
+            } else {
+                w.element.addClass("f-s-n");
+            }
         }
         if (o.columnSize[i] > 0) {
-            w.element.addClass("f-s-n");
             w.element.width(o.columnSize[i] === "" ? "" : (o.columnSize[i] <= 1 ? ((o.columnSize[i] * 100).toFixed(1) + "%") : (o.columnSize[i] / BI.pixRatio + BI.pixUnit)));
         }
         if (o.columnSize[i] === "fill") {

src/core/wrapper/layout/flex/wrapper/flex.wrapper.vertical.js

@@ -36,15 +36,18 @@ BI.FlexWrapperVerticalLayout = BI.inherit(BI.Layout, {
         w.element.css({
             position: "relative"
         });
+        if (o.columnSize[i] !== "auto") {
             if (o.rowSize[i] === "fill" || o.rowSize[i] === "") {
                 if (o.verticalAlign !== BI.VerticalAlign.Stretch) {
                     if (o.scrollable === true || o.scrolly === true) {
                         w.element.addClass("f-s-n");
                     }
                 }
+            } else {
+                w.element.addClass("f-s-n");
+            }
         }
         if (o.rowSize[i] > 0) {
-            w.element.addClass("f-s-n");
             w.element.height(o.rowSize[i] === "" ? "" : (o.rowSize[i] <= 1 ? ((o.rowSize[i] * 100).toFixed(1) + "%") : (o.rowSize[i] / BI.pixRatio + BI.pixUnit)));
         }
         if (o.rowSize[i] === "fill") {