How to filter posts by category INSIDE the loop

Got a quite radical solution : 

function wpse_102497_modify_query_order( $query ) {
    if ( $query->is_main_query() ) {
      $query->set( 'orderby', 'title' );
    }
}
add_action( 'pre_get_posts', 'wpse_102497_modify_query_order' );

Hope this will help.

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