Support animation for PNG and WEBP thumbnails #123
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Add support for PNG and WEBP supports animation like GIF, and ImageMagick has support for both formats.
ImageMagick handles WEBP just like GIF. PNG is a different story.
ImageMagick considers animated PNGs a format separate from PNG, and the .png extension is reserved for non-animated images. Web browsers handles both variants when served as
image/png. I think Paperclip should use .png for both animated and non-animated images, like for GIF and WEBP. This requires a bit of trickery to force ImageMagick to read and write animated PNGs.