Use the featured image instead of the user's avatar when listing ideas

wp-idea-stream-custom.php

<?php
/**
 * Read about how to use the wp-idea-stream-custom.php file here:
 * https://github.com/imath/wp-idea-stream/wiki/wp-idea-stream-custom.php
 */ 


function pc1271_replace_avatar_with_featured_image( $output, $author, $avatar, $idea ) {
	if ( ! wp_idea_stream_featured_images_allowed() || ! current_theme_supports( 'post-thumbnails' ) ) {
		return $output;
	}

	/**
	 * the expected size for the avatar is 96x96px, so let's use it there..
	 */
	$featured_image = get_the_post_thumbnail( $idea, array( 96, 96 ) );

	if ( ! empty( $featured_image ) ) {
		$output = $featured_image;
	}

	return $output;
}
add_filter( 'wp_idea_stream_ideas_get_author_avatar', 'pc1271_replace_avatar_with_featured_image', 10, 4 );