Fix non-nearest-neighbour resize for multi-frame-images

src/ImageSharp/Processing/Transforms/Processors/ResizeProcessor.cs

@@ -368,10 +368,9 @@ namespace SixLabors.ImageSharp.Processing.Transforms.Processors
             }
         }
 
-        /// <inheritdoc />
-        protected override void AfterFrameApply(ImageFrame<TPixel> source, ImageFrame<TPixel> destination, Rectangle sourceRectangle, Configuration configuration)
+        protected override void AfterImageApply(Image<TPixel> source, Image<TPixel> destination, Rectangle sourceRectangle)
         {
-            base.AfterFrameApply(source, destination, sourceRectangle, configuration);
+            base.AfterImageApply(source, destination, sourceRectangle);
 
             // TODO: An exception in the processing chain can leave these buffers undisposed. We should consider making image processors IDisposable!
             this.horizontalWeights?.Dispose();

tests/ImageSharp.Tests/Processing/Processors/Transforms/ResizeTests.cs

@@ -102,7 +102,7 @@ namespace SixLabors.ImageSharp.Tests.Processing.Processors.Transforms
         {
             using (Image<TPixel> image = provider.GetImage())
             {
-                image.Mutate(x => x.Resize(image.Width / 2, image.Height / 2, KnownResamplers.NearestNeighbor));
+                image.Mutate(x => x.Resize(image.Width / 2, image.Height / 2, KnownResamplers.Bicubic));
 
                 // Comparer fights decoder with gif-s. Could not use CompareToReferenceOutput here :(
                 image.DebugSave(provider, extension: Extensions.Gif);