Remove #nullable directives.

src/Avalonia.Controls/Application.cs

@@ -13,7 +13,6 @@ using Avalonia.Platform;
 using Avalonia.Rendering;
 using Avalonia.Styling;
 using Avalonia.Threading;
-#nullable enable
 
 namespace Avalonia
 {

src/Avalonia.Controls/Chrome/CaptionButtons.cs

@@ -3,8 +3,6 @@ using System.Reactive.Disposables;
 using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Primitives;
 
-#nullable enable
-
 namespace Avalonia.Controls.Chrome
 {
     /// <summary>

src/Avalonia.Controls/Chrome/TitleBar.cs

@@ -3,8 +3,6 @@ using System.Reactive.Disposables;
 using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Primitives;
 
-#nullable enable
-
 namespace Avalonia.Controls.Chrome
 {
     /// <summary>

src/Avalonia.Controls/ContextMenu.cs

@@ -14,8 +14,6 @@ using Avalonia.Interactivity;
 using Avalonia.Layout;
 using Avalonia.Styling;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/ContextRequestedEventArgs.cs

@@ -1,8 +1,6 @@
 using Avalonia.Input;
 using Avalonia.Interactivity;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/Control.cs

@@ -9,8 +9,6 @@ using Avalonia.Rendering;
 using Avalonia.Styling;
 using Avalonia.VisualTree;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/Converters/CornerRadiusFilterConverter.cs

@@ -1,5 +1,4 @@
-#nullable enable
+using System;
-using System;
 using System.Globalization;
 
 using Avalonia.Data.Converters;

src/Avalonia.Controls/DefinitionList.cs

@@ -2,8 +2,6 @@ using System.Collections;
 using System.Collections.Specialized;
 using Avalonia.Collections;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     public abstract class DefinitionList<T> : AvaloniaList<T> where T : DefinitionBase

src/Avalonia.Controls/Diagnostics/IPopupHostProvider.cs

@@ -1,8 +1,6 @@
 using System;
 using Avalonia.Controls.Primitives;
 
-#nullable enable
-
 namespace Avalonia.Controls.Diagnostics
 {
     /// <summary>

src/Avalonia.Controls/Diagnostics/ToolTipDiagnostics.cs

@@ -1,6 +1,4 @@
-#nullable enable
+namespace Avalonia.Controls.Diagnostics
-
-namespace Avalonia.Controls.Diagnostics
 {
     /// <summary>
     /// Helper class to provide diagnostics information for <see cref="ToolTip"/>.

src/Avalonia.Controls/Expander.cs

@@ -1,11 +1,8 @@
 using System.Threading;
-
 using Avalonia.Animation;
 using Avalonia.Controls.Metadata;
 using Avalonia.Controls.Primitives;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/Flyouts/Flyout.cs

@@ -1,8 +1,6 @@
 using Avalonia.Controls.Primitives;
 using Avalonia.Metadata;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     public class Flyout : FlyoutBase

src/Avalonia.Controls/Flyouts/FlyoutBase.cs

@@ -8,8 +8,6 @@ using Avalonia.Input.Raw;
 using Avalonia.Layout;
 using Avalonia.Logging;
 
-#nullable enable
-
 namespace Avalonia.Controls.Primitives
 {
     public abstract class FlyoutBase : AvaloniaObject, IPopupHostProvider

src/Avalonia.Controls/Flyouts/MenuFlyout.cs

@@ -4,8 +4,6 @@ using Avalonia.Controls.Primitives;
 using Avalonia.Controls.Templates;
 using Avalonia.Metadata;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     public class MenuFlyout : FlyoutBase

src/Avalonia.Controls/IControl.cs

@@ -3,8 +3,6 @@ using Avalonia.Input;
 using Avalonia.Layout;
 using Avalonia.VisualTree;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/IMenuElement.cs

@@ -1,8 +1,6 @@
 using System.Collections.Generic;
 using Avalonia.Input;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/IMenuItem.cs

@@ -1,6 +1,4 @@
-#nullable enable
+namespace Avalonia.Controls
-
-namespace Avalonia.Controls
 {
     /// <summary>
     /// Represents a <see cref="MenuItem"/>.

src/Avalonia.Controls/IScrollAnchorProvider.cs

@@ -1,6 +1,4 @@
-#nullable enable
+namespace Avalonia.Controls
-
-namespace Avalonia.Controls
 {
     /// <summary>
     /// Specifies a contract for a scrolling control that supports scroll anchoring.

src/Avalonia.Controls/ItemsSourceView.cs

@@ -10,8 +10,6 @@ using System.Collections.Specialized;
 using System.Linq;
 using Avalonia.Controls.Utils;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/MaskedTextBox.cs

@@ -8,8 +8,6 @@ using Avalonia.Input.Platform;
 using Avalonia.Interactivity;
 using Avalonia.Styling;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     public class MaskedTextBox : TextBox, IStyleable

src/Avalonia.Controls/Menu.cs

@@ -5,8 +5,6 @@ using Avalonia.Input;
 using Avalonia.Interactivity;
 using Avalonia.Layout;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/MenuBase.cs

@@ -8,8 +8,6 @@ using Avalonia.Input;
 using Avalonia.Interactivity;
 using Avalonia.LogicalTree;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/MenuItem.cs

@@ -14,8 +14,6 @@ using Avalonia.Interactivity;
 using Avalonia.LogicalTree;
 using Avalonia.VisualTree;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/Platform/DefaultMenuInteractionHandler.cs

@@ -9,8 +9,6 @@ using Avalonia.Rendering;
 using Avalonia.Threading;
 using Avalonia.VisualTree;
 
-#nullable enable
-
 namespace Avalonia.Controls.Platform
 {
     /// <summary>

src/Avalonia.Controls/Platform/ISystemDialogImpl.cs

@@ -1,7 +1,5 @@
 using System.Threading.Tasks;
 
-#nullable enable
-
 namespace Avalonia.Controls.Platform
 {
     /// <summary>

src/Avalonia.Controls/Platform/ITopLevelNativeMenuExporter.cs

@@ -1,8 +1,6 @@
 using System;
 using Avalonia.Platform;
 
-#nullable enable
-
 namespace Avalonia.Controls.Platform
 {
     public interface INativeMenuExporter

src/Avalonia.Controls/Platform/ITrayIconImpl.cs

@@ -1,8 +1,6 @@
 using System;
 using Avalonia.Controls.Platform;
 
-#nullable enable
-
 namespace Avalonia.Platform
 {
     public interface ITrayIconImpl : IDisposable

src/Avalonia.Controls/Platform/IWindowingPlatform.cs

@@ -1,5 +1,3 @@
-#nullable enable
-
 namespace Avalonia.Platform
 {
     public interface IWindowingPlatform

src/Avalonia.Controls/Platform/PlatformManager.cs

@@ -2,8 +2,6 @@ using System;
 using System.Reactive.Disposables;
 using Avalonia.Platform;
 
-#nullable enable
-
 namespace Avalonia.Controls.Platform
 {
     public static partial class PlatformManager

src/Avalonia.Controls/Presenters/ScrollContentPresenter.cs

@@ -7,8 +7,6 @@ using Avalonia.Controls.Primitives;
 using Avalonia.Input;
 using Avalonia.VisualTree;
 
-#nullable enable
-
 namespace Avalonia.Controls.Presenters
 {
     /// <summary>

src/Avalonia.Controls/Primitives/AdornerLayer.cs

@@ -4,8 +4,6 @@ using Avalonia.Media;
 using Avalonia.Rendering;
 using Avalonia.VisualTree;
 
-#nullable enable
-
 namespace Avalonia.Controls.Primitives
 {
     /// <summary>

src/Avalonia.Controls/Primitives/ChromeOverlayLayer.cs

@@ -2,8 +2,6 @@
 using Avalonia.Rendering;
 using Avalonia.VisualTree;
 
-#nullable enable
-
 namespace Avalonia.Controls.Primitives
 {
     public class ChromeOverlayLayer : Panel, ICustomSimpleHitTest

src/Avalonia.Controls/Primitives/HeaderedContentControl.cs

@@ -2,8 +2,6 @@ using Avalonia.Controls.Presenters;
 using Avalonia.Controls.Templates;
 using Avalonia.LogicalTree;
 
-#nullable enable
-
 namespace Avalonia.Controls.Primitives
 {
     /// <summary>

src/Avalonia.Controls/Primitives/LightDismissOverlayLayer.cs

@@ -7,8 +7,6 @@ using Avalonia.Rendering;
 using Avalonia.Styling;
 using Avalonia.VisualTree;
 
-#nullable enable
-
 namespace Avalonia.Controls.Primitives
 {
     /// <summary>

src/Avalonia.Controls/Primitives/Popup.cs

@@ -14,8 +14,6 @@ using Avalonia.Metadata;
 using Avalonia.Platform;
 using Avalonia.VisualTree;
 
-#nullable enable
-
 namespace Avalonia.Controls.Primitives
 {
     /// <summary>

src/Avalonia.Controls/Primitives/SelectingItemsControl.cs

@@ -13,8 +13,6 @@ using Avalonia.Interactivity;
 using Avalonia.Threading;
 using Avalonia.VisualTree;
 
-#nullable enable
-
 namespace Avalonia.Controls.Primitives
 {
     /// <summary>

src/Avalonia.Controls/Primitives/TemplatedControl.cs

@@ -6,8 +6,6 @@ using Avalonia.LogicalTree;
 using Avalonia.Media;
 using Avalonia.Styling;
 
-#nullable enable
-
 namespace Avalonia.Controls.Primitives
 {
     /// <summary>

src/Avalonia.Controls/RelativePanel.AttachedProperties.cs

@@ -1,7 +1,5 @@
 using Avalonia.Layout;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     public partial class RelativePanel

src/Avalonia.Controls/RelativePanel.cs

@@ -4,8 +4,6 @@ using System.Collections.Generic;
 using System.Linq;
 using Avalonia.Layout;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/Repeater/RecyclingElementFactory.cs

@@ -3,8 +3,6 @@ using System.Collections.Generic;
 using System.Linq;
 using Avalonia.Controls.Templates;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     public class SelectTemplateEventArgs : EventArgs

src/Avalonia.Controls/Selection/ISelectionModel.cs

@@ -3,8 +3,6 @@ using System.Collections;
 using System.Collections.Generic;
 using System.ComponentModel;
 
-#nullable enable
-
 namespace Avalonia.Controls.Selection
 {
     public interface ISelectionModel : INotifyPropertyChanged

src/Avalonia.Controls/Selection/IndexRange.cs

@@ -6,8 +6,6 @@
 using System;
 using System.Collections.Generic;
 
-#nullable enable
-
 namespace Avalonia.Controls.Selection
 {
     internal readonly struct IndexRange : IEquatable<IndexRange>

src/Avalonia.Controls/Selection/InternalSelectionModel.cs

@@ -6,8 +6,6 @@ using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using Avalonia.Collections;
 
-#nullable enable
-
 namespace Avalonia.Controls.Selection
 {
     internal class InternalSelectionModel : SelectionModel<object?>

src/Avalonia.Controls/Selection/SelectedIndexes.cs

@@ -3,8 +3,6 @@ using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 
-#nullable enable
-
 namespace Avalonia.Controls.Selection
 {
     internal class SelectedIndexes<T> : IReadOnlyList<int>

src/Avalonia.Controls/Selection/SelectedItems.cs

@@ -3,8 +3,6 @@ using System.Collections;
 using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 
-#nullable enable
-
 namespace Avalonia.Controls.Selection
 {
     internal class SelectedItems<T> : IReadOnlyList<T>

src/Avalonia.Controls/Selection/SelectionModel.cs

@@ -6,8 +6,6 @@ using System.ComponentModel;
 using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 
-#nullable enable
-
 namespace Avalonia.Controls.Selection
 {
     public class SelectionModel<T> : SelectionNodeBase<T>, ISelectionModel

src/Avalonia.Controls/Selection/SelectionModelIndexesChangedEventArgs.cs

@@ -1,7 +1,5 @@
 using System;
 
-#nullable enable
-
 namespace Avalonia.Controls.Selection
 {
     public class SelectionModelIndexesChangedEventArgs : EventArgs

src/Avalonia.Controls/Selection/SelectionModelSelectionChangedEventArgs.cs

@@ -3,8 +3,6 @@ using System.Collections;
 using System.Collections.Generic;
 using Avalonia.Controls.Selection;
 
-#nullable enable
-
 namespace Avalonia.Controls.Selection
 {
     public abstract class SelectionModelSelectionChangedEventArgs : EventArgs

src/Avalonia.Controls/Selection/SelectionNodeBase.cs

@@ -5,8 +5,6 @@ using System.Collections.Specialized;
 using System.Linq;
 using Avalonia.Controls.Utils;
 
-#nullable enable
-
 namespace Avalonia.Controls.Selection
 {
     public abstract class SelectionNodeBase<T> : ICollectionChangedListener

src/Avalonia.Controls/Shapes/Shape.cs

@@ -3,8 +3,6 @@ using Avalonia.Collections;
 using Avalonia.Media;
 using Avalonia.Media.Immutable;
 
-#nullable enable
-
 namespace Avalonia.Controls.Shapes
 {
     /// <summary>

src/Avalonia.Controls/SystemDialog.cs

@@ -4,8 +4,6 @@ using System.Linq;
 using System.Threading.Tasks;
 using Avalonia.Controls.Platform;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     /// <summary>

src/Avalonia.Controls/Templates/DataTemplateExtensions.cs

@@ -1,7 +1,5 @@
 using Avalonia.LogicalTree;
 
-#nullable enable
-
 namespace Avalonia.Controls.Templates
 {
     /// <summary>

src/Avalonia.Controls/Templates/FuncTemplate`2.cs

@@ -1,7 +1,5 @@
 using System;
 
-#nullable enable
-
 namespace Avalonia.Controls.Templates
 {
     /// <summary>

src/Avalonia.Controls/Templates/IDataTemplate.cs

@@ -1,7 +1,5 @@
 using System;
 
-#nullable enable
-
 namespace Avalonia.Controls.Templates
 {
     /// <summary>

src/Avalonia.Controls/Templates/IRecyclingDataTemplate.cs

@@ -1,6 +1,4 @@
-#nullable enable
+namespace Avalonia.Controls.Templates
-
-namespace Avalonia.Controls.Templates
 {
     /// <summary>
     /// An <see cref="IDataTemplate"/> that supports recycling existing elements.

src/Avalonia.Controls/ToolTip.cs

@@ -1,4 +1,3 @@
-#nullable enable
 using System;
 using Avalonia.Controls.Diagnostics;
 using Avalonia.Controls.Metadata;

src/Avalonia.Controls/TrayIcon.cs

@@ -8,8 +8,6 @@ using Avalonia.Controls.Platform;
 using Avalonia.Platform;
 using Avalonia.Utilities;
 
-#nullable enable
-
 namespace Avalonia.Controls
 {
     public sealed class TrayIcons : AvaloniaList<TrayIcon>

src/Avalonia.Controls/Utils/CollectionChangedEventManager.cs

@@ -6,8 +6,6 @@ using System.Runtime.CompilerServices;
 using Avalonia.Threading;
 using Avalonia.Utilities;
 
-#nullable enable
-
 namespace Avalonia.Controls.Utils
 {
     internal interface ICollectionChangedListener