Fix Graphics Font comparison method (#15985)

* Fix the issue

* Added more tests

* Updated Impl

src/Graphics/src/Graphics/Font.cs

@@ -45,8 +45,11 @@ public Font(string name, int weight = FontWeights.Normal, FontStyleType styleTyp
 		public FontStyleType StyleType { get; private set; }
 
 		public bool Equals(IFont other)
-			=> StyleType == other.StyleType && Weight == other.Weight && Name.Equals(other.Name, StringComparison.Ordinal);
-
+			=>
+			StyleType == other.StyleType &&
+			Weight == other.Weight &&
+			((Name is null && other.Name is null) || Name.Equals(other.Name, StringComparison.OrdinalIgnoreCase));
+
 		public override bool Equals(object obj)
 			=> obj is IFont font && Equals(font);
 

src/Graphics/tests/Graphics.Tests/FontUnitTests.cs

@@ -0,0 +1,33 @@
+using Xunit;
+
+namespace Microsoft.Maui.Graphics.Tests
+{
+	public class FontUnitTests
+	{
+		[Fact]
+		public void TestEqualsDefault()
+		{
+			Assert.True(Font.Default.Equals(Font.Default));
+		}
+
+		[Fact]
+		public void TestEqualsDefaultBold()
+		{
+			Assert.True(Font.DefaultBold.Equals(Font.DefaultBold));
+		}
+
+		[Fact]
+		public void TestEqualsDefaultFonts()
+		{
+			Assert.False(Font.Default.Equals(Font.DefaultBold));
+		}
+
+		[Fact]
+		public void TestEqualsArialFont()
+		{
+			var font1 = new Font("Arial");
+			var font2 = new Font("Arial");
+			Assert.True(font1.Equals(font2));
+		}
+	}
+}