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
In TopicController, in addition to ensure_can_move_posts!, we also checked if the topic is private message in this line: ```ruby raise Discourse::InvalidAccess if params[:archetype] == "private_message" && !guardian.is_staff? ``` However, this was not present in `guardian.can_move_posts?`. As a result, the frontend topic view got an incorrect serialized result, thinking that TL4 could move the private message post. In fact, once they tried to move it, they got the `InvalidAccess` error message. This commit fixes that TL4 will no longer sees the "move to" option in the "select post" panel for a private message.