use StringTokenizer to parse PointsList

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

@@ -5,6 +5,7 @@ using System.Globalization;
 namespace Avalonia.Markup.Xaml.Converters
 {
     using System.ComponentModel;
+    using Avalonia.Utilities;
 
     public class PointsListTypeConverter : TypeConverter
     {
@@ -15,15 +16,17 @@ namespace Avalonia.Markup.Xaml.Converters
 
         public override object ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, object value)
         {
-            string strValue = (string)value;
-            string[] pointStrs = strValue.Split(new[] { ' ', '\t', '\r', '\n', ',' }, StringSplitOptions.RemoveEmptyEntries);
-            var result = new List<Point>(pointStrs.Length / 2);
-            for (int i = 0; i < pointStrs.Length; i += 2)
+            var points = new List<Point>();
+
+            using (var tokenizer = new StringTokenizer((string)value, CultureInfo.InvariantCulture, exceptionMessage: "Invalid PointsList."))
             {
-                result.Add(Point.Parse($"{pointStrs[i]} {pointStrs[i + 1]}"));
+                while (tokenizer.TryReadDouble(out double x))
+                {
+                    points.Add(new Point(x, tokenizer.ReadDouble()));
+                }
             }
 
-            return result;
+            return points;
         }
     }
 }