FIX: Auto re-opened topics should restore category auto close settings.

https://meta.discourse.org/t/topic-closed-temporarily-due-to-community-flags-overwrites-category-auto-close-timer/77421

app/jobs/regular/toggle_topic_closed.rb

@@ -16,6 +16,7 @@ module Jobs
 
       if Guardian.new(user).can_close?(topic)
         topic.update_status('autoclosed', state, user)
+        topic.inherit_auto_close_from_category if state == false
       end
     end
   end

spec/jobs/toggle_topic_closed_spec.rb

@@ -28,7 +28,8 @@ describe Jobs::ToggleTopicClosed do
     end
   end
 
-  it 'should be able to open a topic' do
+  describe 'opening a topic' do
+    it 'should be work' do
       topic.update!(closed: true)
 
       freeze_time(1.hour.from_now) do
@@ -45,6 +46,34 @@ describe Jobs::ToggleTopicClosed do
       end
     end
 
+    describe 'when category has auto close configured' do
+      let(:category) { Fabricate(:category, auto_close_hours: 5) }
+      let(:topic) { Fabricate(:topic, category: category, closed: true) }
+
+      it "should restore the category's auto close timer" do
+        Fabricate(:topic_timer,
+          status_type: TopicTimer.types[:open],
+          topic: topic,
+          user: admin
+        )
+
+        freeze_time(1.hour.from_now) do
+          described_class.new.execute(
+            topic_timer_id: topic.public_topic_timer.id,
+            state: false
+          )
+
+          expect(topic.reload.closed).to eq(false)
+
+          topic_timer = topic.public_topic_timer
+
+          expect(topic_timer.status_type).to eq(TopicTimer.types[:close])
+          expect(topic_timer.execute_at).to eq(5.hours.from_now)
+        end
+      end
+    end
+  end
+
   describe 'when trying to close a topic that has been deleted' do
     it 'should not do anything' do
       topic.trash!