FIX: Don't hide/close topics if they don't meet minimum visibility

There are situations where depending on site settings, actions could be
taken due to flags (for example, hiding a post) but those actions were
not visibile in the review queue due to visibility settings.

This patch makes sure that the minimum score required for an action such
as hiding a post needs to meet the visibility for a moderator to see it.

app/models/reviewable.rb

@@ -188,7 +188,7 @@ class Reviewable < ActiveRecord::Base
     end
   end
 
-  def self.sensitivity_score(sensitivity, scale: 1.0)
+  def self.sensitivity_score_value(sensitivity, scale)
     return Float::MAX if sensitivity == 0
 
     ratio = sensitivity / Reviewable.sensitivity[:low].to_f
@@ -199,6 +199,13 @@ class Reviewable < ActiveRecord::Base
     (high.to_f * ratio) * scale
   end
 
+  def self.sensitivity_score(sensitivity, scale: 1.0)
+    # If the score is less than the default visibility, bring it up to that level.
+    # Otherwise we have the confusing situation where a post might be hidden and
+    # moderators would never see it!
+    [sensitivity_score_value(sensitivity, scale), min_score_for_priority].max
+  end
+
   def self.score_to_auto_close_topic
     sensitivity_score(SiteSetting.auto_close_topic_sensitivity, scale: 2.5)
   end

spec/models/reviewable_spec.rb

@@ -302,6 +302,13 @@ RSpec.describe Reviewable, type: :model do
   end
 
   context ".score_required_to_hide_post" do
+
+    it "will return the default visibility if it's higher" do
+      Reviewable.set_priorities(low: 40.0, high: 100.0)
+      SiteSetting.hide_post_sensitivity = Reviewable.sensitivity[:high]
+      expect(Reviewable.score_required_to_hide_post).to eq(40.0)
+    end
+
     it "returns 10 if we can't calculated any percentiles" do
       SiteSetting.hide_post_sensitivity = Reviewable.sensitivity[:low]
       expect(Reviewable.score_required_to_hide_post).to eq(10.0)
@@ -346,6 +353,7 @@ RSpec.describe Reviewable, type: :model do
   end
 
   context ".score_to_auto_close_topic" do
+
     it "returns 25 if we can't calculated any percentiles" do
       SiteSetting.auto_close_topic_sensitivity = Reviewable.sensitivity[:low]
       expect(Reviewable.score_to_auto_close_topic).to eq(25.0)