Don't allow users to auto-hide staff posts

app/models/post_action.rb

@@ -538,7 +538,7 @@ SQL
   end
 
   def self.auto_hide_if_needed(acting_user, post, post_action_type)
-    return if post.hidden
+    return if post.hidden || post.user.staff?
 
     if post_action_type == :spam &&
        acting_user.has_trust_level?(TrustLevel[3]) &&

spec/models/post_action_spec.rb

@@ -362,6 +362,22 @@ describe PostAction do
       expect(post.spam_count).to eq(0)
     end
 
+    it "will not auto hide staff posts" do
+      mod = Fabricate(:moderator)
+      post = Fabricate(:post, user: mod)
+
+      SiteSetting.flags_required_to_hide_post = 2
+      Discourse.stubs(:site_contact_user).returns(admin)
+
+      PostAction.act(eviltrout, post, PostActionType.types[:spam])
+      PostAction.act(Fabricate(:walter_white), post, PostActionType.types[:spam])
+
+      post.reload
+
+      expect(post.hidden).to eq(false)
+      expect(post.hidden_at).to be_blank
+    end
+
     it 'should follow the rules for automatic hiding workflow' do
       post = create_post
       walterwhite = Fabricate(:walter_white)