Merge branch 'master' into datagrid-fixes

.editorconfig

@@ -169,6 +169,8 @@ dotnet_diagnostic.CA1828.severity = warning
 dotnet_diagnostic.CA1829.severity = warning
 #CA1847: Use string.Contains(char) instead of string.Contains(string) with single characters
 dotnet_diagnostic.CA1847.severity = warning
+#CACA2211:Non-constant fields should not be visible
+dotnet_diagnostic.CA2211.severity = error
 
 # Wrapping preferences
 csharp_wrap_before_ternary_opsigns = false

Directory.Build.props

@@ -7,5 +7,6 @@
       <AddSyntheticProjectReferencesForSolutionDependencies>false</AddSyntheticProjectReferencesForSolutionDependencies>
       <MSBuildEnableWorkloadResolver>false</MSBuildEnableWorkloadResolver>
       <RunApiCompat>False</RunApiCompat>
+      <LangVersion>11</LangVersion>
   </PropertyGroup>
 </Project>

build/SharedVersion.props

@@ -8,7 +8,6 @@
     <RepositoryUrl>https://github.com/AvaloniaUI/Avalonia/</RepositoryUrl>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>
     <NoWarn>$(NoWarn);CS1591</NoWarn>
-    <LangVersion>preview</LangVersion>
     <PackageLicenseExpression>MIT</PackageLicenseExpression>
     <PackageIcon>Icon.png</PackageIcon>
     <PackageDescription>Avalonia is a cross-platform UI framework for .NET providing a flexible styling system and supporting a wide range of Operating Systems such as Windows, Linux, macOS and with experimental support for Android, iOS and WebAssembly.</PackageDescription>

global.json

@@ -4,8 +4,6 @@
         "rollForward": "latestFeature"
     },
     "msbuild-sdks": {
-        "Microsoft.Build.Traversal": "1.0.43",
-        "MSBuild.Sdk.Extras": "3.0.22",
-        "AggregatePackage.NuGet.Sdk" : "0.1.12"
+        "Microsoft.Build.Traversal": "1.0.43"
     }
 }

samples/ControlCatalog.Android/MainActivity.cs

@@ -5,7 +5,7 @@ using Avalonia.Android;
 
 namespace ControlCatalog.Android
 {
-    [Activity(Label = "ControlCatalog.Android", Theme = "@style/MyTheme.NoActionBar", Icon = "@drawable/icon", LaunchMode = LaunchMode.SingleTop, ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.ScreenSize)]
+    [Activity(Label = "ControlCatalog.Android", Theme = "@style/MyTheme.Main", Icon = "@drawable/icon", LaunchMode = LaunchMode.SingleTop, ConfigurationChanges = ConfigChanges.Orientation | ConfigChanges.ScreenSize)]
     public class MainActivity : AvaloniaMainActivity
     {
     }

samples/ControlCatalog.Android/Resources/values/styles.xml

@@ -14,4 +14,8 @@
     <item name="android:windowContentOverlay">@null</item>
   </style>
 
+  <style name="MyTheme.Main" parent ="MyTheme.NoActionBar">
+    <item name="android:windowIsTranslucent">true</item>
+  </style>
+
 </resources>

samples/ControlCatalog.Android/SplashActivity.cs

@@ -28,6 +28,8 @@ namespace ControlCatalog.Android
             base.OnResume();
 
             StartActivity(new Intent(Application.Context, typeof(MainActivity)));
+
+            Finish();
         }
     }
 }

samples/ControlCatalog.Browser/Properties/launchSettings.json

@@ -0,0 +1,13 @@
+{
+  "profiles": {
+    "ControlCatalog.Browser": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "inspectUri": "{wsProtocol}://{url.hostname}:{url.port}/debug?browser={browserInspectUri}"
+    }
+  }
+}

samples/ControlCatalog.Desktop/Program.cs

@@ -23,7 +23,7 @@ namespace ControlCatalog
         private static void ConfigureAssetAssembly(AppBuilder builder)
         {
             AvaloniaLocator.CurrentMutable
-                .GetService<IAssetLoader>()
+                .GetRequiredService<IAssetLoader>()
                 .SetDefaultAssembly(typeof(App).Assembly);
         }
     }

samples/ControlCatalog/MainView.xaml

@@ -209,8 +209,7 @@
               </ComboBox.Items>
             </ComboBox>
             <ComboBox x:Name="TransparencyLevels"
-                      HorizontalAlignment="Stretch"
-                      SelectedIndex="{Binding TransparencyLevel}">
+                      HorizontalAlignment="Stretch">
               <ComboBox.Items>
                 <WindowTransparencyLevel>None</WindowTransparencyLevel>
                 <WindowTransparencyLevel>Transparent</WindowTransparencyLevel>

samples/ControlCatalog/MainView.xaml.cs

@@ -6,6 +6,7 @@ using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
 using Avalonia.Media;
 using Avalonia.Media.Immutable;
+using Avalonia.VisualTree;
 using ControlCatalog.Models;
 using ControlCatalog.Pages;
 
@@ -59,17 +60,25 @@ namespace ControlCatalog
             };
 
             var transparencyLevels = this.Get<ComboBox>("TransparencyLevels");
-            IDisposable? backgroundSetter = null, paneBackgroundSetter = null;
+            IDisposable? topLevelBackgroundSideSetter = null, sideBarBackgroundSetter = null, paneBackgroundSetter = null;
             transparencyLevels.SelectionChanged += (sender, e) =>
             {
-                backgroundSetter?.Dispose();
+                topLevelBackgroundSideSetter?.Dispose();
+                sideBarBackgroundSetter?.Dispose();
                 paneBackgroundSetter?.Dispose();
-                if (transparencyLevels.SelectedItem is WindowTransparencyLevel selected
-                    && selected != WindowTransparencyLevel.None)
+                if (transparencyLevels.SelectedItem is WindowTransparencyLevel selected)
                 {
-                    var semiTransparentBrush = new ImmutableSolidColorBrush(Colors.Gray, 0.5);
-                    backgroundSetter = sideBar.SetValue(BackgroundProperty, semiTransparentBrush, Avalonia.Data.BindingPriority.Style);
-                    paneBackgroundSetter = sideBar.SetValue(SplitView.PaneBackgroundProperty, semiTransparentBrush, Avalonia.Data.BindingPriority.Style);
+                    var topLevel = (TopLevel)this.GetVisualRoot()!;
+                    topLevel.TransparencyLevelHint = selected;
+
+                    if (selected != WindowTransparencyLevel.None)
+                    {
+                        var transparentBrush = new ImmutableSolidColorBrush(Colors.White, 0);
+                        var semiTransparentBrush = new ImmutableSolidColorBrush(Colors.Gray, 0.2);
+                        topLevelBackgroundSideSetter = topLevel.SetValue(BackgroundProperty, transparentBrush, Avalonia.Data.BindingPriority.Style);
+                        sideBarBackgroundSetter = sideBar.SetValue(BackgroundProperty, semiTransparentBrush, Avalonia.Data.BindingPriority.Style);
+                        paneBackgroundSetter = sideBar.SetValue(SplitView.PaneBackgroundProperty, semiTransparentBrush, Avalonia.Data.BindingPriority.Style);
+                    }
                 }
             };
         }

samples/ControlCatalog/MainWindow.xaml

@@ -10,7 +10,6 @@
         ExtendClientAreaToDecorationsHint="{Binding ExtendClientAreaEnabled}"
         ExtendClientAreaChromeHints="{Binding ChromeHints}"
         ExtendClientAreaTitleBarHeightHint="{Binding TitleBarHeight}"
-        TransparencyLevelHint="{Binding TransparencyLevel}"        
         x:Name="MainWindow"
         Background="Transparent"
         x:Class="ControlCatalog.MainWindow" WindowState="{Binding WindowState, Mode=TwoWay}"

samples/ControlCatalog/Pages/TabControlPage.xaml.cs

@@ -51,7 +51,7 @@ namespace ControlCatalog.Pages
 
         private static IBitmap LoadBitmap(string uri)
         {
-            var assets = AvaloniaLocator.Current!.GetService<IAssetLoader>()!;
+            var assets = AvaloniaLocator.Current.GetRequiredService<IAssetLoader>();
             return new Bitmap(assets.Open(new Uri(uri)));
         }
     }

samples/ControlCatalog/Pages/TextBoxPage.xaml

@@ -38,7 +38,7 @@
                  UseFloatingWatermark="True"
                  PasswordChar="*"
                  Text="Password" />
-        <TextBox Width="200" Text="Left aligned text" TextAlignment="Left" />
+        <TextBox Width="200" Text="Left aligned text" TextAlignment="Left" AcceptsTab="True" />
         <TextBox Width="200" Text="Center aligned text" TextAlignment="Center" />
         <TextBox Width="200" Text="Right aligned text" TextAlignment="Right" />
         <TextBox Width="200" Text="Custom selection brush"

samples/ControlCatalog/Pages/WindowCustomizationsPage.xaml

@@ -11,12 +11,5 @@
     <CheckBox Content="Title Bar" IsChecked="{Binding SystemTitleBarEnabled}" />    
     <CheckBox Content="Prefer System Chrome" IsChecked="{Binding PreferSystemChromeEnabled}" />
     <Slider Minimum="-1" Maximum="200" Value="{Binding TitleBarHeight}" />
-    <ComboBox x:Name="TransparencyLevels" SelectedIndex="{Binding TransparencyLevel}">
-      <ComboBoxItem>None</ComboBoxItem>
-      <ComboBoxItem>Transparent</ComboBoxItem>
-      <ComboBoxItem>Blur</ComboBoxItem>
-      <ComboBoxItem>AcrylicBlur</ComboBoxItem>
-      <ComboBoxItem>Mica</ComboBoxItem>
-    </ComboBox>
   </StackPanel>
 </UserControl>

samples/ControlCatalog/ViewModels/CursorPageViewModel.cs

@@ -18,7 +18,7 @@ namespace ControlCatalog.ViewModels
                 .Select(x => new StandardCursorModel(x))
                 .ToList();
 
-            var loader = AvaloniaLocator.Current!.GetService<IAssetLoader>()!;
+            var loader = AvaloniaLocator.Current.GetRequiredService<IAssetLoader>();
             var s = loader.Open(new Uri("avares://ControlCatalog/Assets/avalonia-32.png"));
             var bitmap = new Bitmap(s);
             CustomCursor = new Cursor(bitmap, new PixelPoint(16, 16));

samples/ControlCatalog/ViewModels/MainWindowViewModel.cs

@@ -12,12 +12,9 @@ namespace ControlCatalog.ViewModels
 {
     class MainWindowViewModel : ViewModelBase
     {
-        private IManagedNotificationManager _notificationManager;
-
         private bool _isMenuItemChecked = true;
         private WindowState _windowState;
         private WindowState[] _windowStates = Array.Empty<WindowState>();
-        private int _transparencyLevel;
         private ExtendClientAreaChromeHints _chromeHints = ExtendClientAreaChromeHints.PreferSystemChrome;
         private bool _extendClientAreaEnabled;
         private bool _systemTitleBarEnabled;
@@ -77,12 +74,6 @@ namespace ControlCatalog.ViewModels
             TitleBarHeight = -1;
         }        
 
-        public int TransparencyLevel
-        {
-            get { return _transparencyLevel; }
-            set { this.RaiseAndSetIfChanged(ref _transparencyLevel, value); }
-        }        
-
         public ExtendClientAreaChromeHints ChromeHints
         {
             get { return _chromeHints; }

samples/ControlCatalog/ViewModels/TransitioningContentControlPageViewModel.cs

@@ -19,7 +19,7 @@ namespace ControlCatalog.ViewModels
     {
         public TransitioningContentControlPageViewModel()
         {
-            var assetLoader = AvaloniaLocator.Current?.GetService<IAssetLoader>()!;
+            var assetLoader = AvaloniaLocator.Current.GetRequiredService<IAssetLoader>();
 
             var images = new string[] 
             { 

samples/Directory.Build.props

@@ -2,9 +2,8 @@
   <PropertyGroup>
       <IsPackable>false</IsPackable>
       <AvaloniaPreviewerNetCoreToolPath>$(MSBuildThisFileDirectory)..\src\tools\Avalonia.Designer.HostApp\bin\Debug\netcoreapp2.0\Avalonia.Designer.HostApp.dll</AvaloniaPreviewerNetCoreToolPath>
+      <EnableNETAnalyzers>false</EnableNETAnalyzers>
+      <LangVersion>11</LangVersion>
   </PropertyGroup>
   <Import Project="..\build\SharedVersion.props" />
-  <PropertyGroup>
-    <EnableNETAnalyzers>false</EnableNETAnalyzers>
-  </PropertyGroup>  
 </Project>

src/Android/Avalonia.Android/AvaloniaView.cs

@@ -24,6 +24,8 @@ namespace Avalonia.Android
 
             _root = new EmbeddableControlRoot(_view);
             _root.Prepare();
+
+            this.SetBackgroundColor(global::Android.Graphics.Color.Transparent);
         }
 
         internal TopLevelImpl TopLevelImpl => _view;

src/Android/Avalonia.Android/Platform/SkiaPlatform/InvalidationAwareSurfaceView.cs

@@ -22,6 +22,7 @@ namespace Avalonia.Android
         public InvalidationAwareSurfaceView(Context context) : base(context)
         {
             Holder.AddCallback(this);
+            Holder.SetFormat(global::Android.Graphics.Format.Transparent);
             _handler = new Handler(context.MainLooper);
         }
 

src/Android/Avalonia.Android/Platform/SkiaPlatform/TopLevelImpl.cs

@@ -26,6 +26,7 @@ using Avalonia.Rendering.Composition;
 using Java.Lang;
 using Math = System.Math;
 using AndroidRect = Android.Graphics.Rect;
+using Android.Graphics.Drawables;
 
 namespace Avalonia.Android.Platform.SkiaPlatform
 {
@@ -283,7 +284,7 @@ namespace Avalonia.Android.Platform.SkiaPlatform
         public Action LostFocus { get; set; }
         public Action<WindowTransparencyLevel> TransparencyLevelChanged { get; set; }
 
-        public WindowTransparencyLevel TransparencyLevel => WindowTransparencyLevel.None;
+        public WindowTransparencyLevel TransparencyLevel { get; private set; }
 
         public AcrylicPlatformCompensationLevels AcrylicCompensationLevels => new AcrylicPlatformCompensationLevels(1, 1, 1);
 
@@ -301,7 +302,87 @@ namespace Avalonia.Android.Platform.SkiaPlatform
 
         public void SetTransparencyLevelHint(WindowTransparencyLevel transparencyLevel)
         {
-            throw new NotImplementedException();
+            if (TransparencyLevel != transparencyLevel)
+            {
+                bool isBelowR = Build.VERSION.SdkInt < BuildVersionCodes.R;
+                bool isAboveR = Build.VERSION.SdkInt > BuildVersionCodes.R;
+                if (_view.Context is AvaloniaMainActivity activity)
+                {
+                    switch (transparencyLevel)
+                    {
+                        case WindowTransparencyLevel.AcrylicBlur:
+                        case WindowTransparencyLevel.ForceAcrylicBlur:
+                        case WindowTransparencyLevel.Mica:
+                        case WindowTransparencyLevel.None:
+                            if (!isBelowR)
+                            {
+                                activity.SetTranslucent(false);
+                            }
+                            if (isAboveR)
+                            {
+                                activity.Window?.ClearFlags(WindowManagerFlags.BlurBehind);
+
+                                var attr = activity.Window?.Attributes;
+                                if (attr != null)
+                                {
+                                    attr.BlurBehindRadius = 0;
+
+                                    activity.Window.Attributes = attr;
+                                }
+                            }
+                            activity.Window.SetBackgroundDrawable(new ColorDrawable(Color.White));
+
+                            if(transparencyLevel != WindowTransparencyLevel.None)
+                            {
+                                return;
+                            }
+                            break;
+                        case WindowTransparencyLevel.Transparent:
+                            if (!isBelowR)
+                            {
+                                activity.SetTranslucent(true);
+                            }
+                            if (isAboveR)
+                            {
+                                activity.Window?.ClearFlags(WindowManagerFlags.BlurBehind);
+
+                                var attr = activity.Window?.Attributes;
+                                if (attr != null)
+                                {
+                                    attr.BlurBehindRadius = 0;
+
+                                    activity.Window.Attributes = attr;
+                                }
+                            }
+                            activity.Window.SetBackgroundDrawable(new ColorDrawable(Color.Transparent));
+                            break;
+                        case WindowTransparencyLevel.Blur:
+                            if (isAboveR)
+                            {
+                                activity.SetTranslucent(true);
+                                activity.Window?.AddFlags(WindowManagerFlags.BlurBehind);
+
+                                var attr = activity.Window?.Attributes;
+                                if (attr != null)
+                                {
+                                    attr.BlurBehindRadius = 120;
+
+                                    activity.Window.Attributes = attr;
+                                }
+                                activity.Window.SetBackgroundDrawable(new ColorDrawable(Color.Transparent));
+                            }
+                            else
+                            {
+                                activity.Window?.ClearFlags(WindowManagerFlags.BlurBehind);
+                                activity.Window.SetBackgroundDrawable(new ColorDrawable(Color.White));
+
+                                return;
+                            }
+                            break;
+                    }
+                    TransparencyLevel = transparencyLevel;
+                }
+            }
         }
     }
 

src/Avalonia.Base/Controls/NameScopeExtensions.cs

@@ -25,13 +25,18 @@ namespace Avalonia.Controls
 
             var result = nameScope.Find(name);
 
-            if (result != null && !(result is T))
+            if (result == null)
             {
-                throw new InvalidOperationException(
-                    $"Expected control '{name}' to be '{typeof(T)} but it was '{result.GetType()}'.");
+                return null;
             }
 
-            return (T?)result;
+            if (result is T typed)
+            {
+                return typed;
+            }
+
+            throw new InvalidOperationException(
+                $"Expected control '{name}' to be '{typeof(T)} but it was '{result.GetType()}'.");
         }
 
         /// <summary>
@@ -74,13 +79,13 @@ namespace Avalonia.Controls
                 throw new KeyNotFoundException($"Could not find control '{name}'.");
             }
 
-            if (!(result is T))
+            if (result is T typed)
             {
-                throw new InvalidOperationException(
-                    $"Expected control '{name}' to be '{typeof(T)} but it was '{result.GetType()}'.");
+                return typed;
             }
 
-            return (T)result;
+            throw new InvalidOperationException(
+                $"Expected control '{name}' to be '{typeof(T)} but it was '{result.GetType()}'.");
         }
 
         /// <summary>

src/Avalonia.Base/Data/Converters/FuncMultiValueConverter.cs

@@ -38,7 +38,7 @@ namespace Avalonia.Data.Converters
                     }
                     else if (Equals(obj, default(TIn)))
                     {
-                        yield return default(TIn);
+                        yield return default;
                     }
                 }
             }

src/Avalonia.Base/Input/Cursor.cs

@@ -71,8 +71,7 @@ namespace Avalonia.Input
 
         private static ICursorFactory GetCursorFactory()
         {
-            return AvaloniaLocator.Current.GetService<ICursorFactory>() ??
-                throw new Exception("Could not create Cursor: ICursorFactory not registered.");
+            return AvaloniaLocator.Current.GetRequiredService<ICursorFactory>();
         }
     }
 }

src/Avalonia.Base/Layout/WrapLayout/UvMeasure.cs

@@ -7,7 +7,7 @@ namespace Avalonia.Layout
 {    
     internal struct UvMeasure
     {
-        internal static readonly UvMeasure Zero = default(UvMeasure);
+        internal static readonly UvMeasure Zero = default;
 
         internal double U { get; set; }
 

src/Avalonia.Base/Media/DrawingContext.cs

@@ -279,7 +279,7 @@ namespace Avalonia.Media
                 OpacityMask,
             }
 
-            public PushedState(DrawingContext context, PushedStateType type, Matrix matrix = default(Matrix))
+            public PushedState(DrawingContext context, PushedStateType type, Matrix matrix = default)
             {
                 if (context._states is null)
                     throw new ObjectDisposedException(nameof(DrawingContext));

src/Avalonia.Base/Media/DrawingGroup.cs

@@ -76,8 +76,8 @@ namespace Avalonia.Media
         {
             using (context.PushPreTransform(Transform?.Value ?? Matrix.Identity))
             using (context.PushOpacity(Opacity))
-            using (ClipGeometry != null ? context.PushGeometryClip(ClipGeometry) : default(DrawingContext.PushedState))
-            using (OpacityMask != null ? context.PushOpacityMask(OpacityMask, GetBounds()) : default(DrawingContext.PushedState))
+            using (ClipGeometry != null ? context.PushGeometryClip(ClipGeometry) : default)
+            using (OpacityMask != null ? context.PushOpacityMask(OpacityMask, GetBounds()) : default)
             {
                 foreach (var drawing in Children)
                 {

src/Avalonia.Base/Media/FontManager.cs

@@ -47,10 +47,7 @@ namespace Avalonia.Media
                     return current;
                 }
 
-                var fontManagerImpl = AvaloniaLocator.Current.GetService<IFontManagerImpl>();
-
-                if (fontManagerImpl == null)
-                    throw new InvalidOperationException("No font manager implementation was registered.");
+                var fontManagerImpl = AvaloniaLocator.Current.GetRequiredService<IFontManagerImpl>();
 
                 current = new FontManager(fontManagerImpl);
 

src/Avalonia.Base/Media/ImmediateDrawingContext.cs

@@ -218,7 +218,7 @@ namespace Avalonia.Media
                 OpacityMask,
             }
 
-            internal PushedState(ImmediateDrawingContext context, PushedStateType type, Matrix matrix = default(Matrix))
+            internal PushedState(ImmediateDrawingContext context, PushedStateType type, Matrix matrix = default)
             {
                 if (context._states is null)
                     throw new ObjectDisposedException(nameof(ImmediateDrawingContext));

src/Avalonia.Base/Media/TextFormatting/InterWordJustification.cs

@@ -91,7 +91,7 @@ namespace Avalonia.Media.TextFormatting
                     continue;
                 }
 
-                if (textRun is ShapedTextCharacters shapedText)
+                if (textRun is ShapedTextRun shapedText)
                 {
                     var glyphRun = shapedText.GlyphRun;
                     var shapedBuffer = shapedText.ShapedBuffer;

src/Avalonia.Base/Media/TextFormatting/ShapedTextCharacters.cs → src/Avalonia.Base/Media/TextFormatting/ShapedTextRun.cs

@@ -6,11 +6,11 @@ namespace Avalonia.Media.TextFormatting
     /// <summary>
     /// A text run that holds shaped characters.
     /// </summary>
-    public sealed class ShapedTextCharacters : DrawableTextRun
+    public sealed class ShapedTextRun : DrawableTextRun
     {
         private GlyphRun? _glyphRun;
 
-        public ShapedTextCharacters(ShapedBuffer shapedBuffer, TextRunProperties properties)
+        public ShapedTextRun(ShapedBuffer shapedBuffer, TextRunProperties properties)
         {
             ShapedBuffer = shapedBuffer;
             CharacterBufferReference = shapedBuffer.CharacterBufferRange.CharacterBufferReference;
@@ -155,7 +155,7 @@ namespace Avalonia.Media.TextFormatting
             return length > 0;
         }
 
-        internal SplitResult<ShapedTextCharacters> Split(int length)
+        internal SplitResult<ShapedTextRun> Split(int length)
         {
             if (IsReversed)
             {
@@ -171,7 +171,7 @@ namespace Avalonia.Media.TextFormatting
             
             var splitBuffer = ShapedBuffer.Split(length);
 
-            var first = new ShapedTextCharacters(splitBuffer.First, Properties);
+            var first = new ShapedTextRun(splitBuffer.First, Properties);
 
             #if DEBUG
 
@@ -182,9 +182,9 @@ namespace Avalonia.Media.TextFormatting
 
 #endif
 
-            var second = new ShapedTextCharacters(splitBuffer.Second!, Properties);
+            var second = new ShapedTextRun(splitBuffer.Second!, Properties);
 
-            return new SplitResult<ShapedTextCharacters>(first, second);
+            return new SplitResult<ShapedTextRun>(first, second);
         }
 
         internal GlyphRun CreateGlyphRun()

src/Avalonia.Base/Media/TextFormatting/TextCharacters.cs

@@ -91,12 +91,12 @@ namespace Avalonia.Media.TextFormatting
         public override TextRunProperties Properties { get; }
 
         /// <summary>
-        /// Gets a list of <see cref="ShapeableTextCharacters"/>.
+        /// Gets a list of <see cref="UnshapedTextRun"/>.
         /// </summary>
         /// <returns>The shapeable text characters.</returns>
-        internal IReadOnlyList<ShapeableTextCharacters> GetShapeableCharacters(CharacterBufferRange characterBufferRange, sbyte biDiLevel, ref TextRunProperties? previousProperties)
+        internal IReadOnlyList<UnshapedTextRun> GetShapeableCharacters(CharacterBufferRange characterBufferRange, sbyte biDiLevel, ref TextRunProperties? previousProperties)
         {
-            var shapeableCharacters = new List<ShapeableTextCharacters>(2);
+            var shapeableCharacters = new List<UnshapedTextRun>(2);
 
             while (characterBufferRange.Length > 0)
             {
@@ -120,7 +120,7 @@ namespace Avalonia.Media.TextFormatting
         /// <param name="biDiLevel">The bidi level of the run.</param>
         /// <param name="previousProperties"></param>
         /// <returns>A list of shapeable text runs.</returns>
-        private static ShapeableTextCharacters CreateShapeableRun(CharacterBufferRange characterBufferRange,
+        private static UnshapedTextRun CreateShapeableRun(CharacterBufferRange characterBufferRange,
             TextRunProperties defaultProperties, sbyte biDiLevel, ref TextRunProperties? previousProperties)
         {
             var defaultTypeface = defaultProperties.Typeface;
@@ -133,12 +133,12 @@ namespace Avalonia.Media.TextFormatting
                 {
                     if (TryGetShapeableLength(characterBufferRange, previousTypeface.Value, null, out var fallbackCount, out _))
                     {
-                        return new ShapeableTextCharacters(characterBufferRange.CharacterBufferReference, fallbackCount,
+                        return new UnshapedTextRun(characterBufferRange.CharacterBufferReference, fallbackCount,
                             defaultProperties.WithTypeface(previousTypeface.Value), biDiLevel);
                     }
                 }
 
-                return new ShapeableTextCharacters(characterBufferRange.CharacterBufferReference, count, defaultProperties.WithTypeface(currentTypeface),
+                return new UnshapedTextRun(characterBufferRange.CharacterBufferReference, count, defaultProperties.WithTypeface(currentTypeface),
                     biDiLevel);
             }
 
@@ -146,7 +146,7 @@ namespace Avalonia.Media.TextFormatting
             {
                 if (TryGetShapeableLength(characterBufferRange, previousTypeface.Value, defaultTypeface, out count, out _))
                 {
-                    return new ShapeableTextCharacters(characterBufferRange.CharacterBufferReference, count,
+                    return new UnshapedTextRun(characterBufferRange.CharacterBufferReference, count,
                         defaultProperties.WithTypeface(previousTypeface.Value), biDiLevel);
                 }
             }
@@ -176,7 +176,7 @@ namespace Avalonia.Media.TextFormatting
             if (matchFound && TryGetShapeableLength(characterBufferRange, currentTypeface, defaultTypeface, out count, out _))
             {
                 //Fallback found
-                return new ShapeableTextCharacters(characterBufferRange.CharacterBufferReference, count, defaultProperties.WithTypeface(currentTypeface),
+                return new UnshapedTextRun(characterBufferRange.CharacterBufferReference, count, defaultProperties.WithTypeface(currentTypeface),
                     biDiLevel);
             }
 
@@ -199,7 +199,7 @@ namespace Avalonia.Media.TextFormatting
                 count += grapheme.Text.Length;
             }
 
-            return new ShapeableTextCharacters(characterBufferRange.CharacterBufferReference, count, defaultProperties, biDiLevel);
+            return new UnshapedTextRun(characterBufferRange.CharacterBufferReference, count, defaultProperties, biDiLevel);
         }
 
         /// <summary>

src/Avalonia.Base/Media/TextFormatting/TextEllipsisHelper.cs

@@ -31,7 +31,7 @@ namespace Avalonia.Media.TextFormatting
 
                 switch (currentRun)
                 {
-                    case ShapedTextCharacters shapedRun:
+                    case ShapedTextRun shapedRun:
                         {
                             currentWidth += shapedRun.Size.Width;
 

src/Avalonia.Base/Media/TextFormatting/TextFormatterImpl.cs

@@ -124,7 +124,7 @@ namespace Avalonia.Media.TextFormatting
 
                     var second = new List<DrawableTextRun>(secondCount);
 
-                    if (currentRun is ShapedTextCharacters shapedTextCharacters)
+                    if (currentRun is ShapedTextRun shapedTextCharacters)
                     {
                         var split = shapedTextCharacters.Split(length - currentLength);
 
@@ -206,16 +206,16 @@ namespace Avalonia.Media.TextFormatting
                             break;
                         }
 
-                    case ShapeableTextCharacters shapeableRun:
+                    case UnshapedTextRun shapeableRun:
                         {
-                            var groupedRuns = new List<ShapeableTextCharacters>(2) { shapeableRun };
+                            var groupedRuns = new List<UnshapedTextRun>(2) { shapeableRun };
                             var characterBufferReference = currentRun.CharacterBufferReference;
                             var length = currentRun.Length;
                             var offsetToFirstCharacter = characterBufferReference.OffsetToFirstChar;
 
                             while (index + 1 < processedRuns.Count)
                             {
-                                if (processedRuns[index + 1] is not ShapeableTextCharacters nextRun)
+                                if (processedRuns[index + 1] is not UnshapedTextRun nextRun)
                                 {
                                     break;
                                 }
@@ -258,10 +258,10 @@ namespace Avalonia.Media.TextFormatting
             return drawableTextRuns;
         }
 
-        private static IReadOnlyList<ShapedTextCharacters> ShapeTogether(
-            IReadOnlyList<ShapeableTextCharacters> textRuns, CharacterBufferReference text, int length, TextShaperOptions options)
+        private static IReadOnlyList<ShapedTextRun> ShapeTogether(
+            IReadOnlyList<UnshapedTextRun> textRuns, CharacterBufferReference text, int length, TextShaperOptions options)
         {
-            var shapedRuns = new List<ShapedTextCharacters>(textRuns.Count);
+            var shapedRuns = new List<ShapedTextRun>(textRuns.Count);
 
             var shapedBuffer = TextShaper.Current.ShapeText(text, length, options);
 
@@ -271,7 +271,7 @@ namespace Avalonia.Media.TextFormatting
 
                 var splitResult = shapedBuffer.Split(currentRun.Length);
 
-                shapedRuns.Add(new ShapedTextCharacters(splitResult.First, currentRun.Properties));
+                shapedRuns.Add(new ShapedTextRun(splitResult.First, currentRun.Properties));
 
                 shapedBuffer = splitResult.Second!;
             }
@@ -280,9 +280,9 @@ namespace Avalonia.Media.TextFormatting
         }
 
         /// <summary>
-        /// Coalesces ranges of the same bidi level to form <see cref="ShapeableTextCharacters"/>
+        /// Coalesces ranges of the same bidi level to form <see cref="UnshapedTextRun"/>
         /// </summary>
-        /// <param name="textCharacters">The text characters to form <see cref="ShapeableTextCharacters"/> from.</param>
+        /// <param name="textCharacters">The text characters to form <see cref="UnshapedTextRun"/> from.</param>
         /// <param name="levels">The bidi levels.</param>
         /// <returns></returns>
         private static IEnumerable<IReadOnlyList<TextRun>> CoalesceLevels(IReadOnlyList<TextRun> textCharacters, ArraySlice<sbyte> levels)
@@ -474,7 +474,7 @@ namespace Avalonia.Media.TextFormatting
             {
                 switch (currentRun)
                 {
-                    case ShapedTextCharacters shapedTextCharacters:
+                    case ShapedTextRun shapedTextCharacters:
                         {
                             if(shapedTextCharacters.ShapedBuffer.Length > 0)
                             {
@@ -538,7 +538,7 @@ namespace Avalonia.Media.TextFormatting
             var shapedBuffer = new ShapedBuffer(characterBufferRange, glyphInfos, glyphTypeface, properties.FontRenderingEmSize,
                 (sbyte)flowDirection);
 
-            var textRuns = new List<DrawableTextRun> { new ShapedTextCharacters(shapedBuffer, properties) };
+            var textRuns = new List<DrawableTextRun> { new ShapedTextRun(shapedBuffer, properties) };
 
             return new TextLineImpl(textRuns, firstTextSourceIndex, 0, paragraphWidth, paragraphProperties, flowDirection).FinalizeLine();
         }
@@ -744,7 +744,7 @@ namespace Avalonia.Media.TextFormatting
         /// <returns>
         /// The shaped symbol.
         /// </returns>
-        internal static ShapedTextCharacters CreateSymbol(TextRun textRun, FlowDirection flowDirection)
+        internal static ShapedTextRun CreateSymbol(TextRun textRun, FlowDirection flowDirection)
         {
             var textShaper = TextShaper.Current;
 
@@ -760,7 +760,7 @@ namespace Avalonia.Media.TextFormatting
 
             var shapedBuffer = textShaper.ShapeText(characterBuffer, textRun.Length, shaperOptions);
 
-            return new ShapedTextCharacters(shapedBuffer, textRun.Properties);
+            return new ShapedTextRun(shapedBuffer, textRun.Properties);
         }
     }
 }

src/Avalonia.Base/Media/TextFormatting/TextLeadingPrefixCharacterEllipsis.cs

@@ -65,7 +65,7 @@ namespace Avalonia.Media.TextFormatting
 
                 switch (currentRun)
                 {
-                    case ShapedTextCharacters shapedRun:
+                    case ShapedTextRun shapedRun:
                     {
                         currentWidth += currentRun.Size.Width;
 
@@ -118,7 +118,7 @@ namespace Avalonia.Media.TextFormatting
 
                                     switch (run)
                                     {
-                                        case ShapedTextCharacters endShapedRun:
+                                        case ShapedTextRun endShapedRun:
                                         {
                                             if (endShapedRun.TryMeasureCharactersBackwards(availableSuffixWidth,
                                                     out var suffixCount, out var suffixWidth))

src/Avalonia.Base/Media/TextFormatting/TextLineImpl.cs

@@ -192,14 +192,14 @@ namespace Avalonia.Media.TextFormatting
             {
                 var currentRun = _textRuns[i];
 
-                if (currentRun is ShapedTextCharacters shapedRun && !shapedRun.ShapedBuffer.IsLeftToRight)
+                if (currentRun is ShapedTextRun shapedRun && !shapedRun.ShapedBuffer.IsLeftToRight)
                 {
                     var rightToLeftIndex = i;
                     currentPosition += currentRun.Length;
 
                     while (rightToLeftIndex + 1 <= _textRuns.Count - 1)
                     {
-                        var nextShaped = _textRuns[++rightToLeftIndex] as ShapedTextCharacters;
+                        var nextShaped = _textRuns[++rightToLeftIndex] as ShapedTextRun;
 
                         if (nextShaped == null || nextShaped.ShapedBuffer.IsLeftToRight)
                         {
@@ -255,7 +255,7 @@ namespace Avalonia.Media.TextFormatting
 
             switch (run)
             {
-                case ShapedTextCharacters shapedRun:
+                case ShapedTextRun shapedRun:
                     {
                         characterHit = shapedRun.GlyphRun.GetCharacterHitFromDistance(distance, out _);
 
@@ -303,7 +303,7 @@ namespace Avalonia.Media.TextFormatting
                 {
                     var currentRun = _textRuns[index];
 
-                    if (currentRun is ShapedTextCharacters shapedRun && !shapedRun.ShapedBuffer.IsLeftToRight)
+                    if (currentRun is ShapedTextRun shapedRun && !shapedRun.ShapedBuffer.IsLeftToRight)
                     {
                         var i = index;
 
@@ -313,7 +313,7 @@ namespace Avalonia.Media.TextFormatting
                         {
                             var nextRun = _textRuns[i + 1];
 
-                            if (nextRun is ShapedTextCharacters nextShapedRun && !nextShapedRun.ShapedBuffer.IsLeftToRight)
+                            if (nextRun is ShapedTextRun nextShapedRun && !nextShapedRun.ShapedBuffer.IsLeftToRight)
                             {
                                 i++;
 
@@ -407,7 +407,7 @@ namespace Avalonia.Media.TextFormatting
 
             switch (currentRun)
             {
-                case ShapedTextCharacters shapedTextCharacters:
+                case ShapedTextRun shapedTextCharacters:
                     {
                         currentGlyphRun = shapedTextCharacters.GlyphRun;
 
@@ -476,7 +476,7 @@ namespace Avalonia.Media.TextFormatting
 
             switch (currentRun)
             {
-                case ShapedTextCharacters shapedRun:
+                case ShapedTextRun shapedRun:
                     {
                         nextCharacterHit = shapedRun.GlyphRun.GetNextCaretCharacterHit(characterHit);
                         break;
@@ -550,7 +550,7 @@ namespace Avalonia.Media.TextFormatting
 
                 double combinedWidth;
 
-                if (currentRun is ShapedTextCharacters currentShapedRun)
+                if (currentRun is ShapedTextRun currentShapedRun)
                 {
                     var firstCluster = currentShapedRun.GlyphRun.Metrics.FirstCluster;
 
@@ -592,7 +592,7 @@ namespace Avalonia.Media.TextFormatting
                         var rightToLeftIndex = index;
                         var rightToLeftWidth = currentShapedRun.Size.Width;
 
-                        while (rightToLeftIndex + 1 <= _textRuns.Count - 1 && _textRuns[rightToLeftIndex + 1] is ShapedTextCharacters nextShapedRun)
+                        while (rightToLeftIndex + 1 <= _textRuns.Count - 1 && _textRuns[rightToLeftIndex + 1] is ShapedTextRun nextShapedRun)
                         {
                             if (nextShapedRun == null || nextShapedRun.ShapedBuffer.IsLeftToRight)
                             {
@@ -624,12 +624,12 @@ namespace Avalonia.Media.TextFormatting
 
                         for (int i = rightToLeftIndex - 1; i >= index; i--)
                         {
-                            if (TextRuns[i] is not ShapedTextCharacters)
+                            if (TextRuns[i] is not ShapedTextRun)
                             {
                                 continue;
                             }
 
-                            currentShapedRun = (ShapedTextCharacters)TextRuns[i];
+                            currentShapedRun = (ShapedTextRun)TextRuns[i];
 
                             currentRunBounds = GetRightToLeftTextRunBounds(currentShapedRun, startX, firstTextSourceIndex, characterIndex, currentPosition, remainingLength);
 
@@ -769,7 +769,7 @@ namespace Avalonia.Media.TextFormatting
                 var characterLength = 0;
                 var endX = startX;
 
-                if (currentRun is ShapedTextCharacters currentShapedRun)
+                if (currentRun is ShapedTextRun currentShapedRun)
                 {
                     var offset = Math.Max(0, firstTextSourceIndex - currentPosition);
 
@@ -883,7 +883,7 @@ namespace Avalonia.Media.TextFormatting
             return result;
         }
 
-        private TextRunBounds GetRightToLeftTextRunBounds(ShapedTextCharacters currentRun, double endX, int firstTextSourceIndex, int characterIndex, int currentPosition, int remainingLength)
+        private TextRunBounds GetRightToLeftTextRunBounds(ShapedTextRun currentRun, double endX, int firstTextSourceIndex, int characterIndex, int currentPosition, int remainingLength)
         {
             var startX = endX;
 
@@ -945,7 +945,7 @@ namespace Avalonia.Media.TextFormatting
 
         private static sbyte GetRunBidiLevel(DrawableTextRun run, FlowDirection flowDirection)
         {
-            if (run is ShapedTextCharacters shapedTextCharacters)
+            if (run is ShapedTextRun shapedTextCharacters)
             {
                 return shapedTextCharacters.BidiLevel;
             }
@@ -1027,7 +1027,7 @@ namespace Avalonia.Media.TextFormatting
                 {
                     if (current.Level >= minLevelToReverse && current.Level % 2 != 0)
                     {
-                        if (current.Run is ShapedTextCharacters { IsReversed: false } shapedTextCharacters)
+                        if (current.Run is ShapedTextRun { IsReversed: false } shapedTextCharacters)
                         {
                             shapedTextCharacters.Reverse();
                         }
@@ -1145,7 +1145,7 @@ namespace Avalonia.Media.TextFormatting
 
                 switch (currentRun)
                 {
-                    case ShapedTextCharacters shapedRun:
+                    case ShapedTextRun shapedRun:
                         {
                             var foundCharacterHit = shapedRun.GlyphRun.FindNearestCharacterHit(characterHit.FirstCharacterIndex + characterHit.TrailingLength, out _);
 
@@ -1230,7 +1230,7 @@ namespace Avalonia.Media.TextFormatting
 
                 switch (currentRun)
                 {
-                    case ShapedTextCharacters shapedRun:
+                    case ShapedTextRun shapedRun:
                         {
                             var foundCharacterHit = shapedRun.GlyphRun.FindNearestCharacterHit(characterHit.FirstCharacterIndex - 1, out _);
 
@@ -1294,7 +1294,7 @@ namespace Avalonia.Media.TextFormatting
 
                 switch (currentRun)
                 {
-                    case ShapedTextCharacters shapedRun:
+                    case ShapedTextRun shapedRun:
                         {
                             var firstCluster = shapedRun.GlyphRun.Metrics.FirstCluster;
 
@@ -1303,7 +1303,7 @@ namespace Avalonia.Media.TextFormatting
                                 break;
                             }
 
-                            if (previousRun is ShapedTextCharacters previousShaped && !previousShaped.ShapedBuffer.IsLeftToRight)
+                            if (previousRun is ShapedTextRun previousShaped && !previousShaped.ShapedBuffer.IsLeftToRight)
                             {
                                 if (shapedRun.ShapedBuffer.IsLeftToRight)
                                 {
@@ -1394,7 +1394,7 @@ namespace Avalonia.Media.TextFormatting
             {
                 switch (_textRuns[index])
                 {
-                    case ShapedTextCharacters textRun:
+                    case ShapedTextRun textRun:
                         {
                             var textMetrics =
                                 new TextMetrics(textRun.Properties.Typeface.GlyphTypeface, textRun.Properties.FontRenderingEmSize);

src/Avalonia.Base/Media/TextFormatting/TextParagraphProperties.cs

@@ -63,14 +63,11 @@
         {
             get { return 0; }
         }
-        
+
         /// <summary>
         /// Gets the default incremental tab width.
         /// </summary>
-        public virtual double DefaultIncrementalTab
-        {
-            get { return 4 * DefaultTextRunProperties.FontRenderingEmSize; }
-        }
+        public virtual double DefaultIncrementalTab => 0;
 
         /// <summary>
         /// Gets the letter spacing.

src/Avalonia.Base/Media/TextFormatting/TextRun.cs

@@ -44,7 +44,7 @@ namespace Avalonia.Media.TextFormatting
 
                         fixed (char* charsPtr = characterBuffer.Span)
                         {
-                            return new string(charsPtr, 0, characterBuffer.Span.Length);
+                            return new string(charsPtr, _textRun.CharacterBufferReference.OffsetToFirstChar, _textRun.Length);
                         }
                     }
                 }

src/Avalonia.Base/Media/TextFormatting/TextShaper.cs

@@ -29,10 +29,7 @@ namespace Avalonia.Media.TextFormatting
                     return current;
                 }
 
-                var textShaperImpl = AvaloniaLocator.Current.GetService<ITextShaperImpl>();
-
-                if (textShaperImpl == null)
-                    throw new InvalidOperationException("No text shaper implementation was registered.");
+                var textShaperImpl = AvaloniaLocator.Current.GetRequiredService<ITextShaperImpl>();
 
                 current = new TextShaper(textShaperImpl);
 

src/Avalonia.Base/Media/TextFormatting/ShapeableTextCharacters.cs → src/Avalonia.Base/Media/TextFormatting/UnshapedTextRun.cs

@@ -5,9 +5,9 @@ namespace Avalonia.Media.TextFormatting
     /// <summary>
     /// A group of characters that can be shaped.
     /// </summary>
-    public sealed class ShapeableTextCharacters : TextRun
+    public sealed class UnshapedTextRun : TextRun
     {
-        public ShapeableTextCharacters(CharacterBufferReference characterBufferReference, int length,
+        public UnshapedTextRun(CharacterBufferReference characterBufferReference, int length,
             TextRunProperties properties, sbyte biDiLevel)
         {
             CharacterBufferReference = characterBufferReference;
@@ -24,30 +24,30 @@ namespace Avalonia.Media.TextFormatting
 
         public sbyte BidiLevel { get; }
 
-        public bool CanShapeTogether(ShapeableTextCharacters shapeableTextCharacters)
+        public bool CanShapeTogether(UnshapedTextRun unshapedTextRun)
         {
-            if (!CharacterBufferReference.Equals(shapeableTextCharacters.CharacterBufferReference))
+            if (!CharacterBufferReference.Equals(unshapedTextRun.CharacterBufferReference))
             {
                 return false;
             }
 
-            if (BidiLevel != shapeableTextCharacters.BidiLevel)
+            if (BidiLevel != unshapedTextRun.BidiLevel)
             {
                 return false;
             }
 
             if (!MathUtilities.AreClose(Properties.FontRenderingEmSize,
-                    shapeableTextCharacters.Properties.FontRenderingEmSize))
+                    unshapedTextRun.Properties.FontRenderingEmSize))
             {
                 return false;
             }
 
-            if (Properties.Typeface != shapeableTextCharacters.Properties.Typeface)
+            if (Properties.Typeface != unshapedTextRun.Properties.Typeface)
             {
                 return false;
             }
 
-            if (Properties.BaselineAlignment != shapeableTextCharacters.Properties.BaselineAlignment)
+            if (Properties.BaselineAlignment != unshapedTextRun.Properties.BaselineAlignment)
             {
                 return false;
             }

src/Avalonia.Base/Rendering/Composition/Expressions/ExpressionVariant.cs

@@ -654,7 +654,7 @@ namespace Avalonia.Rendering.Composition.Expressions
                 }
             }
 
-            res = default(T);
+            res = default;
             return false;
         }
 

src/Avalonia.Base/Rendering/ImmediateRenderer.cs

@@ -330,11 +330,11 @@ namespace Avalonia.Rendering
                     ? visual is IVisualWithRoundRectClip roundClipVisual
                         ? context.PushClip(new RoundedRect(bounds, roundClipVisual.ClipToBoundsRadius))
                         : context.PushClip(bounds) 
-                    : default(DrawingContext.PushedState))
+                    : default)
 #pragma warning restore CS0618 // Type or member is obsolete
 
-                using (visual.Clip != null ? context.PushGeometryClip(visual.Clip) : default(DrawingContext.PushedState))
-                using (visual.OpacityMask != null ? context.PushOpacityMask(visual.OpacityMask, bounds) : default(DrawingContext.PushedState))
+                using (visual.Clip != null ? context.PushGeometryClip(visual.Clip) : default)
+                using (visual.OpacityMask != null ? context.PushOpacityMask(visual.OpacityMask, bounds) : default)
                 using (context.PushTransformContainer())
                 {
                     visual.Render(context);

src/Avalonia.Base/Rendering/RenderLoop.cs

@@ -50,8 +50,7 @@ namespace Avalonia.Rendering
         {
             get
             {
-                return _timer ??= AvaloniaLocator.Current.GetService<IRenderTimer>() ??
-                    throw new InvalidOperationException("Cannot locate IRenderTimer.");
+                return _timer ??= AvaloniaLocator.Current.GetRequiredService<IRenderTimer>();
             }
         }
 

src/Avalonia.Base/Rendering/Utilities/TileBrushCalculator.cs

@@ -109,7 +109,7 @@ namespace Avalonia.Rendering.Utilities
             {
                 if (IntermediateTransform != Matrix.Identity)
                     return true;
-                if (SourceRect.Position != default(Point))
+                if (SourceRect.Position != default)
                     return true;
                 if (SourceRect.Size.AspectRatio == _imageSize.AspectRatio)
                     return false;

src/Avalonia.Base/Threading/DispatcherTimer.cs

@@ -176,13 +176,7 @@ namespace Avalonia.Threading
         {
             if (!IsEnabled)
             {
-                var threading = AvaloniaLocator.Current.GetService<IPlatformThreadingInterface>();
-
-                if (threading == null)
-                {
-                    throw new Exception("Could not start timer: IPlatformThreadingInterface is not registered.");
-                }
-
+                var threading = AvaloniaLocator.Current.GetRequiredService<IPlatformThreadingInterface>();
                 _timer = threading.StartTimer(_priority, Interval, InternalTick);
             }
         }

src/Avalonia.Base/Utilities/SingleOrDictionary.cs

@@ -42,7 +42,7 @@ namespace Avalonia.Utilities
             {
                 if (!_singleValue.HasValue || !EqualityComparer<TKey>.Default.Equals(_singleValue.Value.Key, key))
                 {
-                    value = default(TValue);
+                    value = default;
                     return false;
                 }
                 else

src/Avalonia.Base/Utilities/StringTokenizer.cs

@@ -63,7 +63,7 @@ namespace Avalonia.Utilities
             }
             else
             {
-                result = default(Int32);
+                result = default;
                 return false;
             }
         }
@@ -87,7 +87,7 @@ namespace Avalonia.Utilities
             }
             else
             {
-                result = default(double);
+                result = default;
                 return false;
             }
         }

src/Avalonia.Base/Visual.cs

@@ -480,6 +480,7 @@ namespace Avalonia
             {
                 AttachToCompositor(compositingRenderer.Compositor);
             }
+            InvalidateMirrorTransform();
             OnAttachedToVisualTree(e);
             AttachedToVisualTree?.Invoke(this, e);
             InvalidateVisual();

src/Avalonia.Build.Tasks/ComInteropHelper.cs

@@ -65,10 +65,8 @@ namespace Avalonia.Build.Tasks
                 {
                     Instruction instruction = instructions[i];
 
-                    if (instruction.OpCode == OpCodes.Call && instruction.Operand is MethodReference)
+                    if (instruction.OpCode == OpCodes.Call && instruction.Operand is MethodReference methodDescription)
                     {
-                        var methodDescription = (MethodReference)instruction.Operand;
-
                         if (methodDescription.Name.StartsWith("Calli") && methodDescription.DeclaringType.Name == "LocalInterop")
                         {
                             var callSite = new CallSite(methodDescription.ReturnType) { CallingConvention = MethodCallingConvention.StdCall };

src/Avalonia.Controls.ColorPicker/ColorPalettes/FlatColorPalette.cs

@@ -289,8 +289,8 @@ namespace Avalonia.Controls
         };
 
         // See: https://htmlcolorcodes.com/assets/downloads/flat-design-colors/flat-design-color-chart.png
-        protected static Color[,]? _colorChart = null;
-        protected static object _colorChartMutex = new object();
+        private static Color[,]? _colorChart = null;
+        private static readonly object _colorChartMutex = new();
 
         /// <summary>
         /// Initializes all color chart colors.

src/Avalonia.Controls.ColorPicker/ColorPalettes/FlatHalfColorPalette.cs

@@ -10,8 +10,8 @@ namespace Avalonia.Controls
     /// <inheritdoc cref="FlatColorPalette"/>
     public class FlatHalfColorPalette : IColorPalette
     {
-        protected static Color[,]? _colorChart = null;
-        protected static object _colorChartMutex = new object();
+        private static Color[,]? _colorChart = null;
+        private static readonly object _colorChartMutex = new();
 
         /// <summary>
         /// Initializes all color chart colors.

src/Avalonia.Controls.ColorPicker/ColorPalettes/MaterialColorPalette.cs

@@ -344,8 +344,8 @@ namespace Avalonia.Controls
 
         // See: https://material.io/design/color/the-color-system.html#tools-for-picking-colors
         // This is a reduced palette for uniformity
-        protected static Color[,]? _colorChart = null;
-        protected static object _colorChartMutex = new object();
+        private static Color[,]? _colorChart = null;
+        private static readonly object _colorChartMutex = new();
 
         /// <summary>
         /// Initializes all color chart colors.

src/Avalonia.Controls.ColorPicker/ColorPalettes/MaterialHalfColorPalette.cs

@@ -10,8 +10,8 @@ namespace Avalonia.Controls
     /// <inheritdoc cref="MaterialColorPalette"/>
     public class MaterialHalfColorPalette : IColorPalette
     {
-        protected static Color[,]? _colorChart = null;
-        protected static object _colorChartMutex = new object();
+        private static Color[,]? _colorChart = null;
+        private static readonly object _colorChartMutex = new();
 
         /// <summary>
         /// Initializes all color chart colors.

src/Avalonia.Controls.DataGrid/DataGrid.cs

@@ -1118,7 +1118,7 @@ namespace Avalonia.Controls
                     EnsureColumnHeadersVisibility();
                     if (!newValueCols)
                     {
-                        _columnHeadersPresenter.Measure(default(Size));
+                        _columnHeadersPresenter.Measure(default);
                     }
                     else
                     {
@@ -1159,7 +1159,7 @@ namespace Avalonia.Controls
                 _topLeftCornerHeader.IsVisible = newValueRows && newValueCols;
                 if (_topLeftCornerHeader.IsVisible)
                 {
-                    _topLeftCornerHeader.Measure(default(Size));
+                    _topLeftCornerHeader.Measure(default);
                 }
             }
 

src/Avalonia.Controls.DataGrid/DataGridCheckBoxColumn.cs

@@ -31,7 +31,7 @@ namespace Avalonia.Controls
         /// <summary>
         /// Defines the <see cref="IsThreeState"/> property.
         /// </summary>
-        public static StyledProperty<bool> IsThreeStateProperty =
+        public static readonly StyledProperty<bool> IsThreeStateProperty =
             CheckBox.IsThreeStateProperty.AddOwner<DataGridCheckBoxColumn>();
 
         /// <summary>

src/Avalonia.Controls.DataGrid/DataGridColumn.cs

@@ -185,7 +185,7 @@ namespace Avalonia.Controls
         /// <summary>
         /// Defines the <see cref="IsVisible"/> property.
         /// </summary>
-        public static StyledProperty<bool> IsVisibleProperty =
+        public static readonly StyledProperty<bool> IsVisibleProperty =
              Control.IsVisibleProperty.AddOwner<DataGridColumn>();
 
         /// <summary>

src/Avalonia.Controls.DataGrid/IndexToValueTable.cs

@@ -422,7 +422,7 @@ namespace Avalonia.Controls
             else
             {
                 found = false;
-                return default(T);
+                return default;
             }
         }
 

src/Avalonia.Controls/AutoCompleteBox/AutoCompleteBox.cs

@@ -474,6 +474,7 @@ namespace Avalonia.Controls
             FilterModeProperty.Changed.AddClassHandler<AutoCompleteBox>((x,e) => x.OnFilterModePropertyChanged(e));
             ItemFilterProperty.Changed.AddClassHandler<AutoCompleteBox>((x,e) => x.OnItemFilterPropertyChanged(e));
             ItemsProperty.Changed.AddClassHandler<AutoCompleteBox>((x,e) => x.OnItemsPropertyChanged(e));
+            ItemTemplateProperty.Changed.AddClassHandler<AutoCompleteBox>((x,e) => x.OnItemTemplatePropertyChanged(e));
             IsEnabledProperty.Changed.AddClassHandler<AutoCompleteBox>((x,e) => x.OnControlIsEnabledChanged(e));
         }
 

src/Avalonia.Controls/Control.cs

@@ -392,14 +392,6 @@ namespace Avalonia.Controls
             OnUnloadedCore();
         }
 
-        /// <inheritdoc/>
-        protected override void OnAttachedToVisualTree(VisualTreeAttachmentEventArgs e)
-        {
-            base.OnAttachedToVisualTree(e);
-
-            InvalidateMirrorTransform();
-        }
-
         /// <inheritdoc/>
         protected override void OnGotFocus(GotFocusEventArgs e)
         {

src/Avalonia.Controls/Diagnostics/ToolTipDiagnostics.cs

@@ -8,6 +8,6 @@
         /// <summary>
         /// Provides access to the internal <see cref="ToolTip.ToolTipProperty"/> for use in DevTools.
         /// </summary>
-        public static AvaloniaProperty<ToolTip?> ToolTipProperty = ToolTip.ToolTipProperty;
+        public static readonly AvaloniaProperty<ToolTip?> ToolTipProperty = ToolTip.ToolTipProperty;
     }
 }

src/Avalonia.Controls/Platform/InProcessDragSource.cs

@@ -41,7 +41,7 @@ namespace Avalonia.Platform
             {
                 _draggedData = data;
                 _lastRoot = null;
-                _lastPosition = default(Point);
+                _lastPosition = default;
                 _allowedEffects = allowedEffects;
 
                 using (_inputManager.PreProcess.OfType<RawPointerEventArgs>().Subscribe(ProcessMouseEvents))

src/Avalonia.Controls/Platform/PlatformManager.cs

@@ -26,21 +26,14 @@ namespace Avalonia.Controls.Platform
 
         public static IWindowImpl CreateWindow()
         {
-            var platform = AvaloniaLocator.Current.GetService<IWindowingPlatform>();
-            
-            if (platform == null)
-            {
-                throw new Exception("Could not CreateWindow(): IWindowingPlatform is not registered.");
-            }
+            var platform = AvaloniaLocator.Current.GetRequiredService<IWindowingPlatform>();
 
             return s_designerMode ? platform.CreateEmbeddableWindow() : platform.CreateWindow();
         }
 
         public static IWindowImpl CreateEmbeddableWindow()
         {
-            var platform = AvaloniaLocator.Current.GetService<IWindowingPlatform>();
-            if (platform == null)
-                throw new Exception("Could not CreateEmbeddableWindow(): IWindowingPlatform is not registered.");
+            var platform = AvaloniaLocator.Current.GetRequiredService<IWindowingPlatform>();
             return platform.CreateEmbeddableWindow();
         }
     }

src/Avalonia.Controls/Presenters/ScrollContentPresenter.cs

@@ -94,6 +94,7 @@ namespace Avalonia.Controls.Presenters
         {
             AddHandler(RequestBringIntoViewEvent, BringIntoViewRequested);
             AddHandler(Gestures.ScrollGestureEvent, OnScrollGesture);
+            AddHandler(Gestures.ScrollGestureEndedEvent, OnScrollGestureEnded);
 
             this.GetObservable(ChildProperty).Subscribe(UpdateScrollableSubscription);
         }
@@ -500,7 +501,7 @@ namespace Avalonia.Controls.Presenters
 
             if (e.OldValue != null)
             {
-                Offset = default(Vector);
+                Offset = default;
             }
         }
 
@@ -542,7 +543,7 @@ namespace Avalonia.Controls.Presenters
             if (logicalScroll != scrollable.IsLogicalScrollEnabled)
             {
                 UpdateScrollableSubscription(Child);
-                Offset = default(Vector);
+                Offset = default;
                 InvalidateMeasure();
             }
             else if (scrollable.IsLogicalScrollEnabled)

src/Avalonia.Controls/PullToRefresh/ScrollViewerIRefreshInfoProviderAdapter.cs

@@ -197,12 +197,12 @@ namespace Avalonia.Controls.PullToRefresh
                 throw new ArgumentException(nameof(_scrollViewer), "Adaptee's content property must be a Visual");
             }
 
-            if (content.Parent is not InputElement)
+            if (content.Parent is not InputElement parent)
             {
                 throw new ArgumentException(nameof(_scrollViewer), "Adaptee's content parent must be an InputElement");
             }
 
-            MakeInteractionSource(content.Parent as InputElement);
+            MakeInteractionSource(parent);
 
             if (_scrollViewer != null)
             {

src/Avalonia.Controls/SelectableTextBlock.cs

@@ -300,7 +300,11 @@ namespace Avalonia.Controls
 
                         _wordSelectionStart = SelectionStart;
 
-                        SelectionEnd = StringUtils.NextWord(text, index);
+                        if (!StringUtils.IsEndOfWord(text, index))
+                        {
+                            SelectionEnd = StringUtils.NextWord(text, index);
+                        }
+                        
                         break;
                     case 3:
                         _wordSelectionStart = -1;

src/Avalonia.Controls/Templates/FuncTreeDataTemplate`1.cs

@@ -59,7 +59,7 @@ namespace Avalonia.Controls.Templates
         /// <returns>The untyped function.</returns>
         private static Func<object?, bool> CastMatch(Func<T, bool> f)
         {
-            return o => (o is T) && f((T)o);
+            return o => o is T arg && f(arg);
         }
 
         /// <summary>
@@ -72,7 +72,7 @@ namespace Avalonia.Controls.Templates
         {
             return (o, s) => f((T)o!, s);
         }
-        
+
         /// <summary>
         /// Casts a function with a typed parameter to an untyped function.
         /// </summary>

src/Avalonia.Controls/TextBox.cs

@@ -1475,7 +1475,11 @@ namespace Avalonia.Controls
 
                         _wordSelectionStart = SelectionStart;
 
-                        SelectionEnd = StringUtils.NextWord(text, index);
+                        if (!StringUtils.IsEndOfWord(text, index))
+                        {
+                            SelectionEnd = StringUtils.NextWord(text, index);
+                        }
+
                         break;
                     case 3:
                         _wordSelectionStart = -1;

src/Avalonia.Controls/TransitioningContentControl.cs

@@ -69,6 +69,10 @@ public class TransitioningContentControl : ContentControl
         {
             Dispatcher.UIThread.Post(() => UpdateContentWithTransition(Content));
         }
+        else if (change.Property == CurrentContentProperty)
+        {
+            UpdateLogicalTree(change.OldValue, change.NewValue);
+        }
     }
 
     protected override void ContentChanged(AvaloniaPropertyChangedEventArgs e)
@@ -94,8 +98,6 @@ public class TransitioningContentControl : ContentControl
         if (PageTransition != null)
             await PageTransition.Start(this, null, true, localToken);
 
-        UpdateLogicalTree(CurrentContent, content);
-
         if (localToken.IsCancellationRequested)
         {
             return;

src/Avalonia.Controls/Utils/StringUtils.cs

@@ -67,6 +67,55 @@ namespace Avalonia.Controls.Utils
             }
         }
 
+        public static bool IsEndOfWord(string text, int index)
+        {
+            if (index >= text.Length)
+            {
+                return true;
+            }
+
+            var codepoint = new Codepoint(text[index]);
+        
+            if (!codepoint.IsWhiteSpace)
+            {
+                return false;
+            }
+            // A 'word' starts with an AlphaNumeric or some punctuation symbols immediately
+            // preceeded by lwsp.
+            if (index > 0)
+            {
+                var nextCodePoint = new Codepoint(text[index + 1]);
+
+                if (nextCodePoint.IsBreakChar)
+                {
+                    return true;
+                }
+            }
+
+            switch (codepoint.GeneralCategory)
+            {
+                case GeneralCategory.LowercaseLetter:
+                case GeneralCategory.TitlecaseLetter:
+                case GeneralCategory.UppercaseLetter:
+                case GeneralCategory.DecimalNumber:
+                case GeneralCategory.LetterNumber:
+                case GeneralCategory.OtherNumber:
+                case GeneralCategory.DashPunctuation:
+                case GeneralCategory.InitialPunctuation:
+                case GeneralCategory.OpenPunctuation:
+                case GeneralCategory.CurrencySymbol:
+                case GeneralCategory.MathSymbol:
+                    return false;
+
+                // TODO: How do you do this in .NET?
+                // case UnicodeCategory.OtherPunctuation:
+                //    // words cannot start with '.', but they can start with '&' or '*' (for example)
+                //    return g_unichar_break_type(buffer->text[index]) == G_UNICODE_BREAK_ALPHABETIC;
+                default:
+                    return true;
+            }
+        }
+
         public static int PreviousWord(string text, int cursor)
         {
             if (string.IsNullOrEmpty(text))

src/Avalonia.Controls/Utils/UndoRedoHelper.cs

@@ -49,7 +49,7 @@ namespace Avalonia.Controls.Utils
 
         public bool TryGetLastState(out TState? _state)
         {
-            _state = default(TState);
+            _state = default;
             if (!IsLastState)
                 return false;
 

src/Avalonia.DesignerSupport/DesignWindowLoader.cs

@@ -18,12 +18,9 @@ namespace Avalonia.DesignerSupport
             Control control;
             using (PlatformManager.DesignerMode())
             {
-                var loader = AvaloniaLocator.Current.GetService<AvaloniaXamlLoader.IRuntimeXamlLoader>();
+                var loader = AvaloniaLocator.Current.GetRequiredService<AvaloniaXamlLoader.IRuntimeXamlLoader>();
                 var stream = new MemoryStream(Encoding.UTF8.GetBytes(xaml));
 
-                if (loader == null)
-                    throw new XamlLoadException("Runtime XAML loader is not registered");
-                
                 Uri baseUri = null;
                 if (assemblyPath != null)
                 {

src/Avalonia.Diagnostics/Diagnostics/ViewModels/ControlDetailsViewModel.cs

@@ -33,12 +33,12 @@ namespace Avalonia.Diagnostics.ViewModels
         {
             _avaloniaObject = avaloniaObject;
 
-            TreePage = treePage;            
-                        Layout =  avaloniaObject is Visual 
-                ?  new ControlLayoutViewModel((Visual)avaloniaObject)
+            TreePage = treePage;
+                        Layout =  avaloniaObject is Visual visual 
+                ?  new ControlLayoutViewModel(visual)
                 : default;
 
-            NavigateToProperty(_avaloniaObject, (_avaloniaObject as Control)?.Name ?? _avaloniaObject.ToString()); 
+            NavigateToProperty(_avaloniaObject, (_avaloniaObject as Control)?.Name ?? _avaloniaObject.ToString());
 
             AppliedStyles = new ObservableCollection<StyleViewModel>();
             PseudoClasses = new ObservableCollection<PseudoClassViewModel>();

src/Avalonia.Dialogs/Internal/ManagedFileChooserViewModel.cs

@@ -117,7 +117,7 @@ namespace Avalonia.Dialogs.Internal
                                               ?? new ManagedFileChooserSources();
 
             var sub1 = AvaloniaLocator.Current
-                                      .GetService<IMountedVolumeInfoProvider>()
+                                      .GetRequiredService<IMountedVolumeInfoProvider>()
                                       .Listen(ManagedFileChooserSources.MountedVolumes);
 
             var sub2 = Observable.FromEventPattern(ManagedFileChooserSources.MountedVolumes,

src/Avalonia.FreeDesktop/DBusMenu.cs

@@ -36,10 +36,10 @@ namespace Avalonia.FreeDesktop.DBusMenu
     [Dictionary]
     class DBusMenuProperties
     {
-        public uint Version { get; set; } = default (uint);
-        public string? TextDirection { get; set; } = default (string);
-        public string? Status { get; set; } = default (string);
-        public string[]? IconThemePath { get; set; } = default (string[]);
+        public uint Version { get; set; } = default;
+        public string? TextDirection { get; set; } = default;
+        public string? Status { get; set; } = default;
+        public string[]? IconThemePath { get; set; } = default;
     }
 
 

src/Avalonia.OpenGL/Egl/EglInterface.cs

@@ -35,7 +35,7 @@ namespace Avalonia.OpenGL.Egl
 
         static Func<string, IntPtr> Load(string library)
         {
-            var dyn = AvaloniaLocator.Current.GetService<IDynamicLibraryLoader>();
+            var dyn = AvaloniaLocator.Current.GetRequiredService<IDynamicLibraryLoader>();
             var lib = dyn.LoadLibrary(library);
             return (s) => dyn.GetProcAddress(lib, s, true);
         }

src/Avalonia.X11/X11Framebuffer.cs

@@ -25,7 +25,7 @@ namespace Avalonia.X11
             RowBytes = width * 4;
             Dpi = new Vector(96, 96) * factor;
             Format = PixelFormat.Bgra8888;
-            _blob = AvaloniaLocator.Current.GetService<IRuntimePlatform>().AllocBlob(RowBytes * height);
+            _blob = AvaloniaLocator.Current.GetRequiredService<IRuntimePlatform>().AllocBlob(RowBytes * height);
             Address = _blob.Address;
         }
         

src/Avalonia.X11/X11Platform.cs

@@ -105,7 +105,7 @@ namespace Avalonia.X11
             var gl = AvaloniaLocator.Current.GetService<IPlatformGraphics>();
             
             if (options.UseCompositor)
-                Compositor = new Compositor(AvaloniaLocator.Current.GetService<IRenderLoop>()!, gl);
+                Compositor = new Compositor(AvaloniaLocator.Current.GetRequiredService<IRenderLoop>(), gl);
             else
                 RenderInterface = new(gl);
 

src/Browser/Avalonia.Browser.Blazor/Avalonia.Browser.Blazor.csproj

@@ -7,6 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <SupportedPlatform Remove="@(SupportedPlatform)" />
     <SupportedPlatform Include="browser" />
   </ItemGroup>
 

src/Browser/Avalonia.Browser.Blazor/AvaloniaView.cs

@@ -8,9 +8,10 @@ using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Rendering;
 using BrowserView = Avalonia.Browser.AvaloniaView;
 
+[assembly: SupportedOSPlatform("browser")]
+
 namespace Avalonia.Browser.Blazor;
 
-[SupportedOSPlatform("browser")]
 public class AvaloniaView : ComponentBase
 {
     private Browser.AvaloniaView? _browserView;

src/Browser/Avalonia.Browser.Blazor/BlazorSingleViewLifetime.cs

@@ -5,7 +5,6 @@ using Avalonia.Controls.ApplicationLifetimes;
 
 namespace Avalonia.Browser.Blazor;
 
-[SupportedOSPlatform("browser")]
 public static class WebAppBuilder
 {
     public static AppBuilder SetupWithSingleViewLifetime(

src/Browser/Avalonia.Browser/Avalonia.Browser.csproj

@@ -1,7 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>net7.0</TargetFramework>
-    <LangVersion>preview</LangVersion>
     <Nullable>enable</Nullable>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
   </PropertyGroup>

src/Browser/Avalonia.Browser/AvaloniaView.cs

@@ -18,7 +18,6 @@ using SkiaSharp;
 
 namespace Avalonia.Browser
 {
-    [System.Runtime.Versioning.SupportedOSPlatform("browser")] // gets rid of callsite warnings
     public partial class AvaloniaView : ITextInputMethodImpl
     {
         private static readonly PooledList<RawPointerPoint> s_intermediatePointsPooledList = new(ClearMode.Never);
@@ -107,7 +106,7 @@ namespace Avalonia.Browser
 
             _dpi = DomHelper.ObserveDpi(OnDpiChanged);
 
-            _useGL = AvaloniaLocator.Current.GetRequiredService<IPlatformGraphics>() != null;
+            _useGL = AvaloniaLocator.Current.GetService<IPlatformGraphics>() != null;
 
             if (_useGL)
             {

src/Browser/Avalonia.Browser/BrowserSingleViewLifetime.cs

@@ -5,7 +5,6 @@ using System.Runtime.Versioning;
 
 namespace Avalonia.Browser;
 
-[SupportedOSPlatform("browser")]
 public class BrowserSingleViewLifetime : ISingleViewApplicationLifetime
 {
     public AvaloniaView? View;
@@ -22,7 +21,6 @@ public class BrowserPlatformOptions
     public Func<string, string> FrameworkAssetPathResolver { get; set; } = new(fileName => $"./{fileName}");
 }
 
-[SupportedOSPlatform("browser")]
 public static class WebAppBuilder
 {
     public static AppBuilder SetupBrowserApp(

src/Browser/Avalonia.Browser/BrowserTopLevelImpl.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
+using System.Runtime.Versioning;
 using Avalonia.Browser.Skia;
 using Avalonia.Browser.Storage;
 using Avalonia.Controls;
@@ -14,9 +15,10 @@ using Avalonia.Platform.Storage;
 using Avalonia.Rendering;
 using Avalonia.Rendering.Composition;
 
+[assembly: SupportedOSPlatform("browser")]
+
 namespace Avalonia.Browser
 {
-    [System.Runtime.Versioning.SupportedOSPlatform("browser")] // gets rid of callsite warnings
     internal class BrowserTopLevelImpl : ITopLevelImplWithTextInputMethod, ITopLevelImplWithNativeControlHost, ITopLevelImplWithStorageProvider
     {
         private Size _clientSize;
@@ -201,7 +203,11 @@ namespace Avalonia.Browser
 
         public void SetTransparencyLevelHint(WindowTransparencyLevel transparencyLevel)
         {
-
+            if (transparencyLevel == WindowTransparencyLevel.None
+                || transparencyLevel == WindowTransparencyLevel.Transparent)
+            {
+                TransparencyLevel = transparencyLevel;
+            }
         }
 
         public Size ClientSize => _clientSize;
@@ -221,7 +227,7 @@ namespace Avalonia.Browser
         public IMouseDevice MouseDevice { get; } = new MouseDevice();
 
         public IKeyboardDevice KeyboardDevice { get; } = BrowserWindowingPlatform.Keyboard;
-        public WindowTransparencyLevel TransparencyLevel { get; }
+        public WindowTransparencyLevel TransparencyLevel { get; private set; }
         public AcrylicPlatformCompensationLevels AcrylicCompensationLevels { get; }
 
         public ITextInputMethodImpl TextInputMethod => _avaloniaView;

src/Browser/Avalonia.Browser/Interop/CanvasHelper.cs

@@ -6,7 +6,6 @@ namespace Avalonia.Browser.Interop;
 
 internal record GLInfo(int ContextId, uint FboId, int Stencils, int Samples, int Depth);
 
-[System.Runtime.Versioning.SupportedOSPlatform("browser")] // gets rid of callsite warnings
 internal static partial class CanvasHelper
 {
 

src/Browser/Avalonia.Browser/Skia/BrowserSkiaGpuRenderTarget.cs

@@ -14,14 +14,12 @@ namespace Avalonia.Browser.Skia
             _size = browserSkiaSurface.Size;
 
             var glFbInfo = new GRGlFramebufferInfo(browserSkiaSurface.GlInfo.FboId, browserSkiaSurface.ColorType.ToGlSizedFormat());
-            {
-                _browserSkiaSurface = browserSkiaSurface;
-                _renderTarget = new GRBackendRenderTarget(
-                    (int)(browserSkiaSurface.Size.Width * browserSkiaSurface.Scaling),
-                    (int)(browserSkiaSurface.Size.Height * browserSkiaSurface.Scaling),
-                    browserSkiaSurface.GlInfo.Samples,
-                    browserSkiaSurface.GlInfo.Stencils, glFbInfo);
-            }
+            _browserSkiaSurface = browserSkiaSurface;
+            _renderTarget = new GRBackendRenderTarget(
+                (int)(browserSkiaSurface.Size.Width * browserSkiaSurface.Scaling),
+                (int)(browserSkiaSurface.Size.Height * browserSkiaSurface.Scaling),
+                browserSkiaSurface.GlInfo.Samples,
+                browserSkiaSurface.GlInfo.Stencils, glFbInfo);
         }
 
         public void Dispose()

src/Browser/Avalonia.Browser/Storage/BlobReadableStream.cs

@@ -7,7 +7,6 @@ using Avalonia.Browser.Interop;
 
 namespace Avalonia.Browser.Storage;
 
-[System.Runtime.Versioning.SupportedOSPlatform("browser")]
 internal class BlobReadableStream : Stream
 {
     private JSObject? _jSReference;

src/Browser/Avalonia.Browser/Storage/BrowserStorageProvider.cs

@@ -13,7 +13,6 @@ namespace Avalonia.Browser.Storage;
 
 internal record FilePickerAcceptType(string Description, IReadOnlyDictionary<string, IReadOnlyList<string>> Accept);
 
-[SupportedOSPlatform("browser")]
 internal class BrowserStorageProvider : IStorageProvider
 {
     internal const string PickerCancelMessage = "The user aborted a request";

src/Browser/Avalonia.Browser/Storage/WriteableStream.cs

@@ -7,7 +7,6 @@ using Avalonia.Browser.Interop;
 
 namespace Avalonia.Browser.Storage;
 
-[System.Runtime.Versioning.SupportedOSPlatform("browser")]
 // Loose wrapper implementaion of a stream on top of FileAPI FileSystemWritableFileStream
 internal sealed class WriteableStream : Stream
 {

src/Browser/Avalonia.Browser/webapp/modules/avalonia/dom.ts

@@ -17,7 +17,6 @@ export class AvaloniaDOM {
         const canvas = document.createElement("canvas");
         canvas.id = `canvas${randomIdPart}`;
         canvas.classList.add("avalonia-canvas");
-        canvas.style.backgroundColor = "#ccc";
         canvas.style.width = "100%";
         canvas.style.position = "absolute";
 

src/Linux/Avalonia.LinuxFramebuffer/FramebufferToplevelImpl.cs

@@ -25,7 +25,7 @@ namespace Avalonia.LinuxFramebuffer
 
             Surfaces = new object[] { _outputBackend };
 
-            Invalidate(default(Rect));
+            Invalidate(default);
             _inputBackend.Initialize(this, e => Input?.Invoke(e));
         }
 

src/Markup/Avalonia.Markup.Xaml.Loader/AvaloniaXamlIlRuntimeCompiler.cs

@@ -179,7 +179,7 @@ namespace Avalonia.Markup.Xaml.XamlIl
             }
             finally
             {
-                if( _sreCanSave)
+                if(!success &&  _sreCanSave)
                     DumpRuntimeCompilationResults();
             }
         }

src/Markup/Avalonia.Markup.Xaml/Converters/BitmapTypeConverter.cs

@@ -24,7 +24,7 @@ namespace Avalonia.Markup.Xaml.Converters
             if(uri.IsAbsoluteUri && uri.IsFile)
                 return new Bitmap(uri.LocalPath);
 
-            var assets = AvaloniaLocator.Current.GetService<IAssetLoader>();
+            var assets = AvaloniaLocator.Current.GetRequiredService<IAssetLoader>();
             return new Bitmap(assets.Open(uri, context.GetContextBaseUri()));
         }
     }

src/Markup/Avalonia.Markup.Xaml/Converters/IconTypeConverter.cs

@@ -40,7 +40,7 @@ namespace Avalonia.Markup.Xaml.Converters
             
             if(uri.IsAbsoluteUri && uri.IsFile)
                 return new WindowIcon(uri.LocalPath);
-            var assets = AvaloniaLocator.Current.GetService<IAssetLoader>();
+            var assets = AvaloniaLocator.Current.GetRequiredService<IAssetLoader>();
             return new WindowIcon(assets.Open(uri, context.GetContextBaseUri()));
         }
     }

src/Markup/Avalonia.Markup/Markup/Parsers/SelectorGrammar.cs

@@ -552,7 +552,8 @@ namespace Avalonia.Markup.Parsers
 
             public override bool Equals(object? obj)
             {
-                return obj is ClassSyntax && ((ClassSyntax)obj).Class == Class;
+                return obj is ClassSyntax syntax &&
+                       syntax.Class == Class;
             }
         }
 
@@ -562,7 +563,8 @@ namespace Avalonia.Markup.Parsers
 
             public override bool Equals(object? obj)
             {
-                return obj is NameSyntax && ((NameSyntax)obj).Name == Name;
+                return obj is NameSyntax syntax &&
+                       syntax.Name == Name;
             }
         }
 
@@ -574,9 +576,9 @@ namespace Avalonia.Markup.Parsers
 
             public override bool Equals(object? obj)
             {
-                return obj is PropertySyntax && 
-                    ((PropertySyntax)obj).Property == Property && 
-                    ((PropertySyntax)obj).Value == Value;
+                return obj is PropertySyntax syntax &&
+                       syntax.Property == Property &&
+                       syntax.Value == Value;
             }
         }
 

src/Skia/Avalonia.Skia/DrawingContextImpl.cs

@@ -224,9 +224,9 @@ namespace Avalonia.Skia
             var impl = (GeometryImpl) geometry;
             var size = geometry.Bounds.Size;
 
-            using (var fill = brush != null ? CreatePaint(_fillPaint, brush, size) : default(PaintWrapper))
+            using (var fill = brush != null ? CreatePaint(_fillPaint, brush, size) : default)
             using (var stroke = pen?.Brush != null ? CreatePaint(_strokePaint, pen, 
-                size.Inflate(new Thickness(pen?.Thickness / 2 ?? 0))) : default(PaintWrapper))
+                size.Inflate(new Thickness(pen?.Thickness / 2 ?? 0))) : default)
             {
                 if (fill.Paint != null)
                 {

src/Skia/Avalonia.Skia/GeometryImpl.cs

@@ -245,7 +245,7 @@ namespace Avalonia.Skia
             {
                 CachedStrokePath?.Dispose();
                 CachedGeometryRenderBounds = default;
-                _cachedStrokeWidth = default(float);
+                _cachedStrokeWidth = default;
             }
         }
     }

src/Skia/Avalonia.Skia/SKTypefaceCollectionCache.cs

@@ -37,7 +37,7 @@ namespace Avalonia.Skia
 
             var typeFaceCollection = new SKTypefaceCollection();
 
-            var assetLoader = AvaloniaLocator.Current.GetService<IAssetLoader>();
+            var assetLoader = AvaloniaLocator.Current.GetRequiredService<IAssetLoader>();
 
             foreach (var asset in fontAssets)
             {

src/Skia/Avalonia.Skia/WriteableBitmapImpl.cs

@@ -96,9 +96,9 @@ namespace Avalonia.Skia
 
             SKColorType colorType = format.ToSkColorType();
             SKAlphaType alphaType = alphaFormat.ToSkAlphaType();
-            
-            var runtimePlatform = AvaloniaLocator.Current?.GetService<IRuntimePlatform>();
-            
+
+            var runtimePlatform = AvaloniaLocator.Current.GetService<IRuntimePlatform>();
+
             if (runtimePlatform != null)
             {
                 _bitmap = new SKBitmap();