Fix issue setting the initial ScrollView properties (VerticalScrollBarVisibility, etc) on WPF (#11918) fixes #11709

Author: jsuarezruiz

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue11709.xaml

@@ -0,0 +1,55 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ContentPage 
+    xmlns="http://xamarin.com/schemas/2014/forms" 
+    xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
+    x:Class="Xamarin.Forms.Controls.Issues.Issue11709"
+    Title="Issue 11709">
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+        </Grid.RowDefinitions>
+        <Label 
+            Padding="12"
+            BackgroundColor="Black"
+            TextColor="White"
+            Text="If even being able to scroll in the ScrollView you cannot see the vertical scrollbar, the test has passed."/>
+        <ScrollView
+            Grid.Row="1"
+            Orientation="Vertical"
+            VerticalScrollBarVisibility="Never">
+            <StackLayout>
+                <Label
+                    FontSize="Large"
+                    Text="Item 1"/>
+                <Label
+                    FontSize="Large"
+                    Text="Item 2"/>
+                <Label
+                    FontSize="Large"
+                    Text="Item 3"/>
+                <Label
+                    FontSize="Large"
+                    Text="Item 4"/>
+                <Label
+                    FontSize="Large"
+                    Text="Item 5"/>
+                <Label
+                    FontSize="Large"
+                    Text="Item 6"/>
+                <Label
+                    FontSize="Large"
+                    Text="Item 7"/>
+                <Label
+                    FontSize="Large"
+                    Text="Item 8"/>
+                <Label
+                    FontSize="Large"
+                    Text="Item 9"/>
+                <Label
+                    FontSize="Large"
+                    Text="Item 10"/>
+            </StackLayout>
+        </ScrollView>
+    </Grid>
+</ContentPage>

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Issue11709.xaml.cs

@@ -0,0 +1,18 @@
+using Xamarin.Forms.CustomAttributes;
+using Xamarin.Forms.Internals;
+
+namespace Xamarin.Forms.Controls.Issues
+{
+
+	[Preserve(AllMembers = true)]
+	[Issue(IssueTracker.Github, 11709, "[Bug] [WPF] ScrollView - ScrollBarVisibility not respected ", PlatformAffected.WPF)]
+	public partial class Issue11709 : ContentPage
+	{
+		public Issue11709()
+		{
+#if APP
+			InitializeComponent();
+#endif
+		}
+	}
+}

Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Xamarin.Forms.Controls.Issues.Shared.projitems

@@ -26,6 +26,9 @@
     </Compile>
     <Compile Include="$(MSBuildThisFileDirectory)Issue10744.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Issue10909.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Issue11709.xaml.cs">
+      <DependentUpon>Issue11709.xaml</DependentUpon>
+    </Compile>
     <Compile Include="$(MSBuildThisFileDirectory)Issue11794.xaml.cs">
       <DependentUpon>Issue11794.xaml</DependentUpon>
     </Compile>
@@ -2283,6 +2286,10 @@
     </EmbeddedResource>
   </ItemGroup>
   <ItemGroup>
+    <EmbeddedResource Include="$(MSBuildThisFileDirectory)Issue11709.xaml">
+      <SubType>Designer</SubType>
+      <Generator>MSBuild:UpdateDesignTimeXaml</Generator>
+    </EmbeddedResource>
     <EmbeddedResource Include="$(MSBuildThisFileDirectory)Issue11794.xaml">
       <SubType>Designer</SubType>
       <Generator>MSBuild:UpdateDesignTimeXaml</Generator>

Xamarin.Forms.Platform.WPF/Properties/AssemblyInfo.cs

@@ -83,4 +83,4 @@
 			+ ThisAssembly.Git.SemVer.Patch
 			+ ThisAssembly.Git.SemVer.DashLabel + "+"
 			+ ThisAssembly.Git.Commits + "-sha."
-			+ ThisAssembly.Git.Commit)]
+			+ ThisAssembly.Git.Commit)]

Xamarin.Forms.Platform.WPF/Renderers/ScrollViewRenderer.cs

@@ -41,9 +41,11 @@ protected override void OnElementChanged(ElementChangedEventArgs<ScrollView> e)
 					Control.LayoutUpdated += NativeLayoutUpdated;
 				}
 
-				// Update control property 
-				UpdateOrientation();
+				// Update control properties
 				LoadContent();
+				UpdateOrientation();
+				UpdateHorizontalScrollBarVisibility();
+				UpdateVerticalScrollBarVisibility();
 
 				// Suscribe element event
 				Controller.ScrollToRequested += OnScrollToRequested;