Fixed FixedRowLength behavior

Author: Avid29

components/WrapPanel2/samples/WrapPanel2BasicSample.xaml

@@ -1,4 +1,4 @@
-<!--  Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information.  -->
+<!--  Licensed to the .NET Foundation under one or more agreements. The .NET Foundation licenses this file to you under the MIT license. See the LICENSE file in the project root for more information.  -->
 <Page x:Class="WrapPanel2Experiment.Samples.WrapPanel2BasicSample"
       xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
       xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
@@ -20,7 +20,7 @@
         </Style>
     </Page.Resources>
 
-    <Grid MaxHeight="600">
+    <Grid MaxHeight="600" Margin="16">
         <Grid.RowDefinitions>
             <RowDefinition Height="auto" />
             <RowDefinition />

components/WrapPanel2/src/WrapPanel2.cs

@@ -133,7 +133,7 @@ private void ArrangeRow(ref UVCoord pos, RowSpec row, UVCoord uvFinalSize, Queue
         }
 
         // Set a flag for if the row is being forced to stretch
-        bool forceStretch = row.PortionsSum is 0 && StretchChildren is not StretchChildren.StarSizedOnly;
+        bool forceStretch = FixedRowLengths && row.PortionsSum is 0 && StretchChildren is not StretchChildren.StarSizedOnly;
 
         // Setup portionSize for forced stretching
         if (forceStretch)