Add test case for tiled tiff, deflate compressed with predictor

src/ImageSharp/Formats/Tiff/TiffDecoderCore.cs

@@ -717,7 +717,8 @@ internal class TiffDecoderCore : ImageDecoderCore
                     // Undo the horziontal predictor for each tile row.
                     if (this.Predictor == TiffPredictor.Horizontal)
                     {
-                        HorizontalPredictor.UndoRow(uncompressedPixelRow, tileLength, 0, this.ColorType);
+                        int pixelsInTileRow = isLastHorizontalTile ? remainingPixelsInRow : tileLength;
+                        HorizontalPredictor.UndoRow(uncompressedPixelRow, pixelsInTileRow, 0, this.ColorType);
                     }
 
                     tileBufferOffset += bytesPerTileRow;

tests/ImageSharp.Tests/Formats/Tiff/TiffDecoderTests.cs

@@ -87,6 +87,7 @@ public class TiffDecoderTests : TiffDecoderBaseTester
     [WithFile(QuadTile, PixelTypes.Rgba32)]
     [WithFile(TiledChunky, PixelTypes.Rgba32)]
     [WithFile(TiledPlanar, PixelTypes.Rgba32)]
+    [WithFile(TiledDeflateCompressedWithPredictor, PixelTypes.Rgba32)]
     public void TiffDecoder_CanDecode_Tiled<TPixel>(TestImageProvider<TPixel> provider)
         where TPixel : unmanaged, IPixel<TPixel> => TestTiffDecoder(provider);
 

tests/ImageSharp.Tests/TestImages.cs

@@ -986,6 +986,7 @@ public static class TestImages
         public const string QuadTile = "Tiff/quad-tile.tiff";
         public const string TiledChunky = "Tiff/rgb_uncompressed_tiled_chunky.tiff";
         public const string TiledPlanar = "Tiff/rgb_uncompressed_tiled_planar.tiff";
+        public const string TiledDeflateCompressedWithPredictor = "Tiff/tiled_rgba_deflate_compressed_predictor.tiff";
 
         // Images with alpha channel.
         public const string Rgba2BitUnassociatedAlpha = "Tiff/RgbaUnassociatedAlpha2bit.tiff";

tests/Images/Input/Tiff/tiled_rgba_deflate_compressed_predictor.tiff

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:c4f44a67086fafc1d8784922a491e0b944b4afcd09f14b66d951b042d2745e0c
+size 166487