Support `Download` for txt files.

def save_image(image, path, basename, seed=None, prompt=None, extension='png', info=None, short_filename=False, no_prompt=False, grid=False, pnginfo_section_name='parameters', p=None, existing_info=None, forced_filename=None, suffix="", save_to_dirs=None):

    '''Save an image.

    Args:

        image (`PIL.Image`):

            The image to be saved.

        path (`str`):

            The directory to save the image. Note, the option `save_to_dirs` will make the image to be saved into a sub directory.

        basename (`str`):

            The base filename which will be applied to `filename pattern`.

        seed, prompt, short_filename, 

        extension (`str`):

            Image file extension, default is `png`.

        pngsectionname (`str`):

            Specify the name of the section which `info` will be saved in.

        info (`str` or `PngImagePlugin.iTXt`):

            PNG info chunks.

        existing_info (`dict`):

            Additional PNG info. `existing_info == {pngsectionname: info, ...}`

        no_prompt:

            TODO I don't know its meaning.

        p (`StableDiffusionProcessing`)

        forced_filename (`str`):

            If specified, `basename` and filename pattern will be ignored.

        save_to_dirs (bool):

            If true, the image will be saved into a subdirectory of `path`.

    Returns: (fullfn, txt_fullfn)

        fullfn (`str`):

            The full path of the saved imaged.

        txt_fullfn (`str` or None):

            If a text file is saved for this image, this will be its full path. Otherwise None.

    '''

    if short_filename or prompt is None or seed is None:

        file_decoration = ""

    elif opts.save_to_dirs:

            piexif.insert(exif_bytes(), fullfn_without_extension + ".jpg")

    if opts.save_txt and info is not None:

        with open(f"{fullfn_without_extension}.txt", "w", encoding="utf8") as file:

        txt_fullfn = f"{fullfn_without_extension}.txt"

        with open(txt_fullfn, "w", encoding="utf8") as file:

            file.write(info + "\n")

    else:

        txt_fullfn = None

    return fullfn

    return fullfn, txt_fullfn

            is_grid = image_index < p.index_of_first_image

            i = 0 if is_grid else (image_index - p.index_of_first_image)

            fullfn = save_image(image, path, "", seed=p.all_seeds[i], prompt=p.all_prompts[i], extension=extension, info=p.infotexts[image_index], grid=is_grid, p=p, save_to_dirs=save_to_dirs)

            fullfn, txt_fullfn = save_image(image, path, "", seed=p.all_seeds[i], prompt=p.all_prompts[i], extension=extension, info=p.infotexts[image_index], grid=is_grid, p=p, save_to_dirs=save_to_dirs)

            filename = os.path.relpath(fullfn, path)

            filenames.append(filename)

            fullfns.append(fullfn)

            if txt_fullfn:

                filenames.append(os.path.basename(txt_fullfn))

                fullfns.append(txt_fullfn)

        writer.writerow([data["prompt"], data["seed"], data["width"], data["height"], data["sampler"], data["cfg_scale"], data["steps"], filenames[0], data["negative_prompt"]])