When `SiteSetting.review_every_post` is true and the category `require_topic_approval` system creates two reviewable items.
1. Firstly, because the category needs approval, the `ReviewableQueuePost` record` is created - at this stage, no topic is created.
2. Admin is approving the review. The topic and first post are created.
3. Because `review_every_post` is true `queue_for_review_if_possible` callback is evaluated and `ReviewablePost` is created.
4. Then `ReviewableQueuePost` is linked to the newly generated topic and post.
At the beginning, we were thinking about hooking to those guards:
```
def self.queue_for_review_if_possible(post, created_or_edited_by)
return unless SiteSetting.review_every_post
return if post.post_type != Post.types[:regular] || post.topic.private_message?
return if Reviewable.pending.where(target: post).exists?
...
```
And add something like
```
return if Reviewable.approved.where(target: post).exists?
```
However, because the callback happens in point 3. before the `ReviewableQueuePost` is linked to the `Topic`, it was not possible.
Therefore, when `ReviewableQueuePost` is creating a `Topic`, a new option called `:reviewed_queued_post` is passed to `PostCreator` to avoid creating a second `Reviewable`.
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