[WordPress] Override author drop down to include all users from all roles/ caps in post creation screens

gistfile1.txt

/**
 * override output of author drop down to include ALL user roles 
 */ 
add_filter('wp_dropdown_users', 'include_all_users');
function include_all_users($output)
{
    //set the $post global for checking user against author 
    global $post; 
    $users = get_users();
	$current_user =  wp_get_current_user();

    $output = '<select id="post_author_override" name="post_author_override" class="">';

    //Loop through each user
    foreach($users as $user){
    
    //if the post's author matches the user ID, set it to "selected" so it will appear when you load the page
    //else, set as empty 
    // In doing tests, it seems as though new posts set the "author" to the current user automatically
    
			if($post->post_author == $user->ID){
			
				$select =  'selected';
				
			}else{
			
				$select = '';
			} // end if post_author == user id 
			
		//output an <option> tag with each user's info and output results of $select 	
        $output .= '<option value="'.$user->ID.'"'.$select.'>'.$user->user_login.'</option>';
    } //end foreach
    $output .= '</select>';

    return $output;
}