Hide comments for non-admin users from Assignments/Essays on Dashboard Activity Widget

/**
* LearnDash - Hide comments from Assignments and Essay from showing on Dashboard Activity Widget
 */
add_action( 'pre_get_comments', function ( $comment_query ) {
	$current_screen = get_current_screen();
	if ( $current_screen->id == 'dashboard' ) {
		if ( !current_user_can( 'moderate_comments' ) ) {
			$post_query_args = array(
				'post_type'			=>	array('sfwd-assignment', 'sfwd-essays'),
				'post_status'		=>	array( 'draft', 'publish', 'graded', 'not_graded' ),
				'fields'			=>	'ids',
				'nopaging'			=>	true
			);
	
			$post_query = new WP_Query( $post_query_args );
			if ( ( $post_query instanceof WP_Query ) && ( !empty( $post_query->posts ) ) ) {
				$post__not_in = array();

				if ( $comment_query->query_vars['post__not_in'] == '' )
					$post__not_in = $post_query->posts;	
				else {
					$post__not_in = array_merge( (array)$comment_query->query_vars['post__not_in'], $post_query->posts );
				}

				if ( !empty( $post__not_in ) )
					$comment_query->query_vars['post__not_in'] = $post__not_in;
			}
		}
	}
}, 100);

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