Filter direct statuses in Status.as_home_timeline (#3842)

The classes using Status.as_home_timeline, namely Feed and
PrecomputeFeedService are expected to filter direct statuses as
FanOutWriteService does, but their filtering were incomplete or missing.

This commit solves the problem by filtering direct statuses in
as_home_timeline as the other similar methods such as as_public_timeline
does.

spec/models/status_spec.rb

@@ -181,15 +181,18 @@ RSpec.describe Status, type: :model do
   end
 
   describe '.as_home_timeline' do
+    let(:account) { Fabricate(:account) }
+    let(:followed) { Fabricate(:account) }
+    let(:not_followed) { Fabricate(:account) }
+
     before do
-      account = Fabricate(:account)
-      followed = Fabricate(:account)
-      not_followed = Fabricate(:account)
       Fabricate(:follow, account: account, target_account: followed)
 
-      @self_status = Fabricate(:status, account: account)
-      @followed_status = Fabricate(:status, account: followed)
-      @not_followed_status = Fabricate(:status, account: not_followed)
+      @self_status = Fabricate(:status, account: account, visibility: :public)
+      @self_direct_status = Fabricate(:status, account: account, visibility: :direct)
+      @followed_status = Fabricate(:status, account: followed, visibility: :public)
+      @followed_direct_status = Fabricate(:status, account: followed, visibility: :direct)
+      @not_followed_status = Fabricate(:status, account: not_followed, visibility: :public)
 
       @results = Status.as_home_timeline(account)
     end
@@ -198,10 +201,23 @@ RSpec.describe Status, type: :model do
       expect(@results).to include(@self_status)
     end
 
+    it 'includes direct statuses from self' do
+      expect(@results).to include(@self_direct_status)
+    end
+
     it 'includes statuses from followed' do
       expect(@results).to include(@followed_status)
     end
 
+    it 'includes direct statuses mentioning recipient from followed' do
+      Fabricate(:mention, account: account, status: @followed_direct_status)
+      expect(@results).to include(@followed_direct_status)
+    end
+
+    it 'does not include direct statuses not mentioning recipient from followed' do
+      expect(@results).not_to include(@followed_direct_status)
+    end
+
     it 'does not include statuses from non-followed' do
       expect(@results).not_to include(@not_followed_status)
     end