Update to 11.0.0-preview1

ReactiveHistory.sln

@@ -47,6 +47,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "props", "props", "{1C68A69B
 		build\XUnit.props = build\XUnit.props
 		build\SourceLink.props = build\SourceLink.props
 		build\Avalonia.Web.Blazor.props = build\Avalonia.Web.Blazor.props
+		build\Avalonia.Themes.Fluent.props = build\Avalonia.Themes.Fluent.props
 	EndProjectSection
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "git", "git", "{97B14D1B-E4E9-4076-9FEE-BB8155017B35}"

build/Avalonia.Desktop.props

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
-    <PackageReference Include="Avalonia.Desktop" Version="0.10.12" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.0.0-preview1" />
   </ItemGroup>
 </Project>

build/Avalonia.Diagnostics.props

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
-    <PackageReference Include="Avalonia.Diagnostics" Version="0.10.12" />
+    <PackageReference Include="Avalonia.Diagnostics" Version="11.0.0-preview1" />
   </ItemGroup>
 </Project>

build/Avalonia.Themes.Fluent.props

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.0-preview1" />
+  </ItemGroup>
+</Project>

build/Avalonia.Web.Blazor.props

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
-    <PackageReference Include="Avalonia.Web.Blazor" Version="0.10.12" />
+    <PackageReference Include="Avalonia.Web.Blazor" Version="11.0.0-preview1" />
   </ItemGroup>
 </Project>

build/Avalonia.props

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <ItemGroup>
-    <PackageReference Include="Avalonia" Version="0.10.12" />
+    <PackageReference Include="Avalonia" Version="11.0.0-preview1" />
   </ItemGroup>
 </Project>

build/Base.props

@@ -1,7 +1,7 @@
 <Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <PropertyGroup>
-    <VersionPrefix>0.10.12</VersionPrefix>
-    <VersionSuffix></VersionSuffix>
+    <VersionPrefix>11.0.0</VersionPrefix>
+    <VersionSuffix>preview1</VersionSuffix>
     <Authors>Wiesław Šoltés</Authors>
     <Company>Wiesław Šoltés</Company>
     <Copyright>Copyright © Wiesław Šoltés 2022</Copyright>

samples/ReactiveHistorySample.Base/ReactiveHistorySample.Base.csproj

@@ -18,7 +18,7 @@
   <Import Project="..\..\build\ReferenceAssemblies.props" />
   <Import Project="..\..\build\Rx.props" />
   <Import Project="..\..\build\Avalonia.props" />
-  <Import Project="..\..\build\Avalonia.Desktop.props" />
+  <Import Project="..\..\build\Avalonia.Themes.Fluent.props" />
   <Import Project="..\..\build\ReactiveProperty.props" />
 
   <ItemGroup>

samples/ReactiveHistorySample.Base/Views/MainView.axaml.cs

@@ -82,6 +82,10 @@ public class MainView : UserControl
     private void HandleEvents(Layer layer1, StackHistory history)
     {
         var layerCanvas = this.FindControl<LayerCanvas>("layerCanvas");
+        if (layerCanvas is null)
+        {
+            return;
+        }
 
         LineShape? line = null;