[WASM] fix cursors. works fine

src/Web/Avalonia.Web.Blazor/AvaloniaView.razor.cs

@@ -22,6 +22,7 @@ namespace Avalonia.Web.Blazor
         private DpiWatcherInterop _dpiWatcher = null!;
         private SKHtmlCanvasInterop.GLInfo? _jsGlInfo = null!;
         private InputHelperInterop _inputHelper = null!;
+        private InputHelperInterop _canvasHelper = null!;
         private ElementReference _htmlCanvas;
         private ElementReference _inputElement;
         private double _dpi;
@@ -254,10 +255,11 @@ namespace Avalonia.Web.Blazor
                 Threading.Dispatcher.UIThread.Post(async () =>
                 {
                     _inputHelper = await InputHelperInterop.ImportAsync(Js, _inputElement);
+                    _canvasHelper = await InputHelperInterop.ImportAsync(Js, _htmlCanvas);
 
                     _inputHelper.Hide();
-                    _inputHelper.SetCursor("default");
+                    _canvasHelper.SetCursor("default");
-                    _topLevelImpl.SetCssCursor = _inputHelper.SetCursor;
+                    _topLevelImpl.SetCssCursor = _canvasHelper.SetCursor;
 
                     Console.WriteLine("starting html canvas setup");
                     _interop = await SKHtmlCanvasInterop.ImportAsync(Js, _htmlCanvas, OnRenderFrame);

src/Web/Avalonia.Web.Blazor/Cursor.cs

@@ -5,6 +5,7 @@ namespace Avalonia.Web.Blazor
 {
     public class CssCursor : ICursorImpl
     {
+        public const string Default = "default";
         public string? Value { get; set; }
         
         public CssCursor(StandardCursorType type)
@@ -17,7 +18,7 @@ namespace Avalonia.Web.Blazor
         /// </summary>
         public CssCursor(string base64, string format, PixelPoint hotspot, StandardCursorType fallback)
         {
-            Value = $"url(data:image/{format},{base64}) {hotspot.X} {hotspot.Y}, {ToKeyword(fallback)}";
+            Value = $"url(\"data:image/{format};base64,{base64}\") {hotspot.X} {hotspot.Y}, {ToKeyword(fallback)}";
         }
         
         /// <summary>
@@ -65,7 +66,7 @@ namespace Avalonia.Web.Blazor
             StandardCursorType.BottomLeftCorner => "sw-resize",
             StandardCursorType.BottomRightCorner => "se-resize",
             
-            _ => "default",
+            _ => Default,
         };
         
         public void Dispose() {}

src/Web/Avalonia.Web.Blazor/RazorViewTopLevelImpl.cs

@@ -21,6 +21,7 @@ namespace Avalonia.Web.Blazor
         private readonly Stopwatch _sw = Stopwatch.StartNew();
         private readonly ITextInputMethodImpl _textInputMethod;
         private readonly TouchDevice _touchDevice;
+        private string _currentCursor = CssCursor.Default;
 
         public RazorViewTopLevelImpl(ITextInputMethodImpl textInputMethod)
         {
@@ -127,11 +128,15 @@ namespace Avalonia.Web.Blazor
         public void SetCursor(ICursorImpl cursor)
         {
             var cur = cursor as CssCursor;
-            if (cur == null || cur.Value == null)
+            var val = CssCursor.Default;
+            if (cur != null && cur.Value != null)
             {
-                throw new NotSupportedException();
+                val = cur.Value;
+            }
+            if (_currentCursor != val)
+            {
+                SetCssCursor?.Invoke(val);
             }
-            SetCssCursor?.Invoke(cur.Value);
         }
 
         public IPopupImpl? CreatePopup()