Remove public setter where possible on events or replace with "init;"

src/Avalonia.Base/Input/GotFocusEventArgs.cs

@@ -7,19 +7,18 @@ namespace Avalonia.Input
     /// </summary>
     public class GotFocusEventArgs : RoutedEventArgs
     {
-        internal GotFocusEventArgs()
+        public GotFocusEventArgs() : base(InputElement.GotFocusEvent)
         {
-
         }
 
         /// <summary>
         /// Gets or sets a value indicating how the change in focus occurred.
         /// </summary>
-        public NavigationMethod NavigationMethod { get; set; }
+        public NavigationMethod NavigationMethod { get; init; }
 
         /// <summary>
         /// Gets or sets any key modifiers active at the time of focus.
         /// </summary>
-        public KeyModifiers KeyModifiers { get; set; }
+        public KeyModifiers KeyModifiers { get; init; }
     }
 }

src/Avalonia.Base/Input/KeyEventArgs.cs

@@ -10,10 +10,10 @@ namespace Avalonia.Input
 
         }
 
-        public IKeyboardDevice? Device { get; set; }
+        public IKeyboardDevice? Device { get; init; }
 
-        public Key Key { get; set; }
+        public Key Key { get; init; }
 
-        public KeyModifiers KeyModifiers { get; set; }
+        public KeyModifiers KeyModifiers { get; init; }
     }
 }

src/Avalonia.Base/Input/KeyboardDevice.cs

@@ -156,7 +156,6 @@ namespace Avalonia.Input
 
                 interactive?.RaiseEvent(new GotFocusEventArgs
                 {
-                    RoutedEvent = InputElement.GotFocusEvent,
                     NavigationMethod = method,
                     KeyModifiers = keyModifiers,
                 });

src/Avalonia.Base/Input/PointerDeltaEventArgs.cs

@@ -7,7 +7,7 @@ namespace Avalonia.Input
 {
     public class PointerDeltaEventArgs : PointerEventArgs
     {
-        public Vector Delta { get; set; }
+        public Vector Delta { get; }
 
         [Unstable]
         [Obsolete("This constructor might be removed in 12.0.")]

src/Avalonia.Base/Input/PointerWheelEventArgs.cs

@@ -7,7 +7,7 @@ namespace Avalonia.Input
 {
     public class PointerWheelEventArgs : PointerEventArgs
     {
-        public Vector Delta { get; set; }
+        public Vector Delta { get; }
 
         [Unstable]
         [Obsolete("This constructor might be removed in 12.0. For unit testing, consider using IHeadlessWindow.MouseWheel.")]

src/Avalonia.Base/Input/Raw/RawTextInputEventArgs.cs

@@ -12,6 +12,6 @@ namespace Avalonia.Input.Raw
             Text = text;
         }
 
-        public string Text { get; set; }
+        public string Text { get; }
     }
 }

src/Avalonia.Base/Input/VectorEventArgs.cs

@@ -5,6 +5,6 @@ namespace Avalonia.Input
 {
     public class VectorEventArgs : RoutedEventArgs
     {
-        public Vector Vector { get; set; }
+        public Vector Vector { get; init; }
     }
 }

tests/Avalonia.Controls.UnitTests/ListBoxTests_Multiple.cs

@@ -28,7 +28,6 @@ namespace Avalonia.Controls.UnitTests
 
             target.Presenter.Panel.Children[1].RaiseEvent(new GotFocusEventArgs
             {
-                RoutedEvent = InputElement.GotFocusEvent,
                 NavigationMethod = NavigationMethod.Directional,
                 KeyModifiers = KeyModifiers.Shift
             });
@@ -52,7 +51,6 @@ namespace Avalonia.Controls.UnitTests
 
             target.Presenter.Panel.Children[1].RaiseEvent(new GotFocusEventArgs
             {
-                RoutedEvent = InputElement.GotFocusEvent,
                 NavigationMethod = NavigationMethod.Directional,
                 KeyModifiers = KeyModifiers.Control
             });
@@ -77,7 +75,6 @@ namespace Avalonia.Controls.UnitTests
 
             target.Presenter.Panel.Children[0].RaiseEvent(new GotFocusEventArgs
             {
-                RoutedEvent = InputElement.GotFocusEvent,
                 NavigationMethod = NavigationMethod.Directional,
                 KeyModifiers = KeyModifiers.Control
             });

tests/Avalonia.Controls.UnitTests/ListBoxTests_Single.cs

@@ -33,7 +33,6 @@ namespace Avalonia.Controls.UnitTests
 
             target.Presenter.Panel.Children[0].RaiseEvent(new GotFocusEventArgs
             {
-                RoutedEvent = InputElement.GotFocusEvent,
                 NavigationMethod = NavigationMethod.Tab,
             });
 
@@ -53,7 +52,6 @@ namespace Avalonia.Controls.UnitTests
 
             target.Presenter.Panel.Children[0].RaiseEvent(new GotFocusEventArgs
             {
-                RoutedEvent = InputElement.GotFocusEvent,
                 NavigationMethod = NavigationMethod.Directional,
             });
 
@@ -73,7 +71,6 @@ namespace Avalonia.Controls.UnitTests
 
             target.Presenter.Panel.Children[0].RaiseEvent(new GotFocusEventArgs
             {
-                RoutedEvent = InputElement.GotFocusEvent,
                 NavigationMethod = NavigationMethod.Directional,
                 KeyModifiers = KeyModifiers.Control
             });
@@ -96,7 +93,6 @@ namespace Avalonia.Controls.UnitTests
 
                 target.Presenter.Panel.Children[0].RaiseEvent(new GotFocusEventArgs
                 {
-                    RoutedEvent = InputElement.GotFocusEvent,
                     NavigationMethod = NavigationMethod.Directional,
                     KeyModifiers = KeyModifiers.Control
                 });