Added test image & test method

ImageSharp.sln

@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
+# Visual Studio Version 17
-VisualStudioVersion = 16.0.28902.138
+VisualStudioVersion = 17.0.31710.8
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "_root", "_root", "{C317F1B1-D75E-4C6D-83EB-80367343E0D7}"
 	ProjectSection(SolutionItems) = preProject

tests/ImageSharp.Tests/Formats/Png/PngDecoderTests.cs

@@ -368,6 +368,24 @@ namespace SixLabors.ImageSharp.Tests.Formats.Png
             Assert.Null(ex);
         }
 
+        // https://github.com/SixLabors/ImageSharp/issues/1765
+        [Theory]
+        [WithFile(TestImages.Png.Issue1765, PixelTypes.Rgba32)]
+        public void Issue1765<TPixel>(TestImageProvider<TPixel> provider)
+            where TPixel : unmanaged, IPixel<TPixel>
+        {
+            System.Exception ex = Record.Exception(
+                () =>
+                {
+                    using (Image<TPixel> image = provider.GetImage(PngDecoder))
+                    {
+                        image.DebugSave(provider);
+                        image.CompareToOriginal(provider, ImageComparer.Exact);
+                    }
+                });
+            Assert.Null(ex);
+        }
+
         // https://github.com/SixLabors/ImageSharp/issues/410
         [Theory]
         [WithFile(TestImages.Png.Bad.Issue410_MalformedApplePng, PixelTypes.Rgba32)]

tests/ImageSharp.Tests/TestImages.cs

@@ -111,6 +111,9 @@ namespace SixLabors.ImageSharp.Tests
             // Issue 935: https://github.com/SixLabors/ImageSharp/issues/935
             public const string Issue935 = "Png/issues/Issue_935.png";
 
+            // Issue 1765: https://github.com/SixLabors/ImageSharp/issues/1765
+            public const string Issue1765 = "png/issues/Issue_1765.png";
+
             public static class Bad
             {
                 public const string MissingDataChunk = "Png/xdtn0g01.png";

tests/Images/Input/Png/issues/Issue_1765.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:86ea14567bcd259d76dc782ee366c23a5755714c6d48f636524b23e75b89e5b6
+size 775275