anomore

Thank you man!
I realized that my fix didn’t work well, but I didn’t have time to work on this.

— Update —

In my article category doesn’t appears the box for header selection.

• This reply was modified 7 years, 11 months ago by anomore.

The problem is Twenty Sixteen uses get_custom_header() that uses header_image_data.
I solved the problem by changing the plugin in this way:

File class-unique-headers-display.php:

Add add_filter( 'theme_mod_header_image_data', array( 'Custom_Image_Meta_Box', 'header_image_data_filter' ), 20 ); after add_filter( 'theme_mod_header_image', array( $this, 'header_image_filter' ), 20 );

File class-unique-headers-taxonomy-header-images.php:

Add add_filter( 'theme_mod_header_image_data', array( 'Custom_Image_Meta_Box', 'header_image_data_filter' ), 5 ); after add_filter( 'theme_mod_header_image', array( $this, 'header_image_filter' ), 5 );

File class-custom-image-meta-box.php:

Add this static method to class:

static function header_image_data_filter( $data ) {
	if (!$data) return;

	$url = get_header_image();

	return (object) array(
		'attachment_id' => attachment_url_to_postid($url),
		'url'           => $url,
		'thumbnail_url' => $url,
		'height'        => $data->height,
		'width'         => $data->width,
	);
}

Bye!