Updated decimal formatting and test cases

Harmonized decimal formatting between different target platforms

Author: codebude

QRCoder/SvgQRCode.cs

@@ -243,7 +243,9 @@ private struct ImageAttributes
         private string CleanSvgVal(double input)
         {
             //Clean double values for international use/formats
-            return input.ToString(System.Globalization.CultureInfo.InvariantCulture);
+            //We use explicitly "G15" to avoid differences between .NET full and Core platforms
+            //https://stackoverflow.com/questions/64898117/tostring-has-a-different-behavior-between-net-462-and-net-core-3-1
+            return input.ToString("G15", System.Globalization.CultureInfo.InvariantCulture);
         }
 
         /// <summary>

QRCoderTests/SvgQRCodeRendererTests.cs

@@ -64,7 +64,7 @@ public void can_render_svg_qrcode_viewbox_mode()
             var svg = new SvgQRCode(data).GetGraphic(new Size(128,128));
 
             var result = HelperFunctions.StringToHash(svg);
-            result.ShouldBe("ec9a13c4484d246e3e2e0574958845c8");
+            result.ShouldBe("56719c7db39937c74377855a5dc4af0a");
         }
 
         [Fact]