Merge pull request #836 from Keboo/fixVirtualization

Defaulting CanContentScroll to be true to fix virtualization.

Author: ButchersBoy

MaterialDesignThemes.Wpf/Themes/MaterialDesignTheme.ListView.xaml

@@ -10,6 +10,7 @@
     </ResourceDictionary.MergedDictionaries>
 
     <Style x:Key="{x:Static GridView.GridViewScrollViewerStyleKey}" TargetType="{x:Type ScrollViewer}">
+        <Setter Property="CanContentScroll" Value="True" />
         <Setter Property="Template">
             <Setter.Value>
                 <ControlTemplate TargetType="{x:Type ScrollViewer}">
@@ -227,7 +228,6 @@
         <Setter Property="BorderThickness" Value="0" />
         <Setter Property="FontSize" Value="13" />
         <Setter Property="ItemContainerStyle" Value="{Binding RelativeSource={RelativeSource Self}, Path=View, Converter={StaticResource MaterialDesignListViewItemContainerStyleConverter}}" />
-        <Setter Property="ScrollViewer.CanContentScroll" Value="True" />
         <Setter Property="ScrollViewer.PanningMode" Value="Both" />
         <Setter Property="Stylus.IsFlicksEnabled" Value="False" />
         <Setter Property="SnapsToDevicePixels" Value="True" />