title: How do you add_filter to only one instance of the_title()
body: <p>I created a filter that modifies the_title() of a post, but the problem I'm having is that it's modifying every instance of the_title(). I got most of the problem sorted out with the in_the_loop() function, however any theme that has "next post" "previous post" navigation links within the loop are still having the filter applied (understandably so). How can I apply the filter to only the the_title() of the current post?</p>
  
  <pre><code>function xyz_the_title( $the_title ) {
  
      if( !in_the_loop() )
          return $the_title;
  
      $location = get_post_meta( get_the_ID(), 'location', true );
  
      $the_title .= ' - ' . $location;
  
      return $the_title;  
  
  }
  
  add_filter( 'the_title', 'xyz_the_title' );
  </code></pre>