strip tags, so that strlen would count only real text

see #41

Author: pfefferle

includes/class-linkbacks-handler.php

@@ -587,7 +587,7 @@ public static function comment_text_excerpt( $text, $comment = null, $args = arr
 		$host = preg_replace( '/^www\./', '', $host );
 
 		// generate output. use full content if it's small enough, otherwise use excerpt.
-		$text_len = mb_strlen( html_entity_decode( $text, ENT_QUOTES ) );
+		$text_len = mb_strlen( wp_strip_all_tags( html_entity_decode( $text, ENT_QUOTES ) ) );
 		if ( ! ( 'mention' === $semantic_linkbacks_type && $text_len <= MAX_INLINE_MENTION_LENGTH ) ) {
 			$text = sprintf( $comment_type_excerpts[ $semantic_linkbacks_type ], get_comment_author_link( $comment->comment_ID ), $post_type, $url, $host );
 		}