Merges handlers default values.
string $type: The name of the handler type option.
protected function mergeHandler($type) {
$types = ViewExecutable::viewsHandlerTypes();
$options = $this
->getOption($types[$type]['plural']);
foreach ($this
->getHandlers($type) as $id => $handler) {
if (isset($options[$id])) {
$options[$id] = $options[$id] + $handler->options;
}
}
$this
->setOption($types[$type]['plural'], $options);
}