widget can use predefined thumbnail, but shortcode can’t

I can use predefined size (e.g. thumb100) in widget.
However, I can not be specify it in shortcode.

I tried writing a small patch. I think this is inadequate, but I hope it will be helpful.

thanks.

# diff -u public/class-wordpress-popular-posts-public.php.old public/class-wordpress-popular-posts-public.php 
--- public/class-wordpress-popular-posts-public.php.old	2017-10-29 08:07:38.400567528 +0900
+++ public/class-wordpress-popular-posts-public.php	2017-11-04 06:46:50.383114490 +0900
@@ -293,6 +293,7 @@
             'excerpt_by_words' => 0,
             'thumbnail_width' => 0,
             'thumbnail_height' => 0,
+            'thumbnail_build' => 'predefined',
             'rating' => false,
             'stats_comments' => false,
             'stats_views' => true,
@@ -344,6 +345,7 @@
                 'active' => ( !empty( $thumbnail_width ) && WPP_Helper::is_number( $thumbnail_width ) && $thumbnail_width > 0 ),
                 'width' => ( !empty( $thumbnail_width ) && WPP_Helper::is_number( $thumbnail_width ) && $thumbnail_width > 0 ) ? $thumbnail_width : 0,
                 'height' => ( !empty( $thumbnail_height ) && WPP_Helper::is_number( $thumbnail_height ) && $thumbnail_height > 0 ) ? $thumbnail_height : 0,
+				'build' => empty( $thumbnail_build) ? 'predefined' : $thumbnail_build,
             ),
             'rating' => empty( $rating ) ? false : $rating,
             'stats_tag' => array(