fix strange happengings in IsCorrupted, sizes being updated without any IsCorrupted true returned.

src/Web/Avalonia.Web.Blazor/BlazorSkiaGpuRenderTarget.cs

@@ -38,6 +38,12 @@ namespace Avalonia.Web.Blazor
         {
             get
             {
+                if( _blazorSkiaSurface.IsDirty )
+                {
+                    _blazorSkiaSurface.IsDirty = false;
+                    return true;
+                }
+
                 var result = _size.Width != _renderTarget.Width || _size.Height != _renderTarget.Height;
 
                 return result;

src/Web/Avalonia.Web.Blazor/BlazorSkiaSurface.cs

@@ -26,5 +26,7 @@ namespace Avalonia.Web.Blazor
         public double Scaling { get; set; }
 
         public SKHtmlCanvasInterop.GLInfo GlInfo { get; set; }
+
+        public bool IsDirty { get; set; }
     }
 }

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

@@ -51,6 +51,8 @@ namespace Avalonia.Web.Blazor
                 if (_currentSurface is { })
                 {
                     _currentSurface.Size = new PixelSize((int)size.Width, (int)size.Height);
+
+                    _currentSurface.IsDirty = true;
                 }
 
                 Resized?.Invoke(newSize, PlatformResizeReason.User);