Stop recreating related items on every save

[antonioribeiro]

Summary

Blocks and browsers when connected to related items make use of this code:

public function saveRelated($items, $browser_name)
{
    $this->clearRelated($browser_name);

    $position = 1;

    Collection::make($items)->map(function ($item) {
        return Arr::only($item, ['endpointType', 'id']);
    })->each(function ($values) use ($browser_name, &$position) {
        RelatedItem::create([
            'subject_id' => $this->getKey(),
            'subject_type' => $this->getMorphClass(),
            'related_id' => $values['id'],
            'related_type' => $values['endpointType'],
            'browser_name' => $browser_name,
            'position' => $position,
        ]);
        $position++;
    });
}

Not only this increases the number of dead rows on the related table, by deleting then recreating them every time, but, when nothing changed on a module, it also gives the false impression something has changed, as Laravel will fire eloquent.created events for these changes.