Added post thumbnail to the links

I added the post thumbnail to the plugin, only the “Top” version which is what I needed. Here is the code if you are interested in adding this as a feature.

in load_settings:

$pre_post_thumb = $pre_post->ID!=""?get_the_post_thumbnail($pre_post->ID, array(50,50)):'';
$next_post_thumb = $next_post->ID!=""?get_the_post_thumbnail($next_post->ID, array(50,50)):'';

$this->config["preThumb"] = $pre_post_thumb;
$this->config["nextThumb"] = $next_post_thumb;

 in WP_Pre_Next_Navigation:

 case "top":
	return '<div class="wp-post-navigation">
	<div class="wp-post-navigation-pre'.$this->config["hasImage"].'">
	'.'<span style="float:left;padding-right:5px">'.$this->config["preThumb"].'</span>'.$this->config["prePost"].'
	</div>
	<div class="wp-post-navigation-next'.$this->config["hasImage"].'">
	'.'<span style="float:right;padding-left:5px">'.$this->config["nextThumb"].'</span>'.$this->config["nextPost"].'
	</div>
	</div>'.$content;
break;

https://www.ads-software.com/plugins/wp-post-navigation/