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<?php
// Hook includes/class-fv-functions.php :: render_template()
//apply_filters( 'fv_template_variables', $variables, $type, $template_path );

add_filter( 'fv_template_variables', 'fv_change_descr_to_full_descr', 10, 2 );

function fv_change_descr_to_full_descr($variables, $type) {
  if ($type == 'theme') {
    $variables['description'] = $variables['photo']->full_description;
  }
  return $variables;
}