Add test case for issue 2763

tests/ImageSharp.Tests/Formats/WebP/WebpEncoderTests.cs

@@ -497,6 +497,23 @@ public class WebpEncoderTests
         image.VerifyEncoder(provider, "webp", string.Empty, encoder, ImageComparer.Tolerant(0.04f));
     }
 
+    // https://github.com/SixLabors/ImageSharp/issues/2763
+    [Theory]
+    [WithFile(Lossy.Issue2763, PixelTypes.Rgba32)]
+    public void WebpDecoder_CanDecode_Issue2763<TPixel>(TestImageProvider<TPixel> provider)
+        where TPixel : unmanaged, IPixel<TPixel>
+    {
+        WebpEncoder encoder = new()
+        {
+            Quality = 84,
+            FileFormat = WebpFileFormatType.Lossless
+        };
+
+        using Image<TPixel> image = provider.GetImage(PngDecoder.Instance);
+        image.DebugSave(provider);
+        image.VerifyEncoder(provider, "webp", string.Empty, encoder);
+    }
+
     public static void RunEncodeLossy_WithPeakImage()
     {
         TestImageProvider<Rgba32> provider = TestImageProvider<Rgba32>.File(TestImageLossyFullPath);

tests/ImageSharp.Tests/TestImages.cs

@@ -821,6 +821,7 @@ public static class TestImages
             public const string Issue2243 = "Webp/issues/Issue2243.webp";
             public const string Issue2257 = "Webp/issues/Issue2257.webp";
             public const string Issue2670 = "Webp/issues/Issue2670.webp";
+            public const string Issue2763 = "Webp/issues/Issue2763.png";
         }
     }
 

tests/Images/Input/Webp/issues/Issue2763.png

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:eb221c5045e9bcbfdb7f4704aa571d910ca0d382fe4748319fe56f4c8c2aab78
+size 429101