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.

app/models/status.rb

@@ -131,7 +131,15 @@ class Status < ApplicationRecord
     end
 
     def as_home_timeline(account)
-      where(account: [account] + account.following)
+      # 'references' is a workaround for the following issue:
+      # Inconsistent results with #or in ActiveRecord::Relation with respect to documentation Issue #24055 rails/rails
+      # https://github.com/rails/rails/issues/24055
+      references(:mentions)
+        .where.not(visibility: :direct)
+        .or(where(mentions: { account: account }))
+        .where(follows: { account_id: account })
+        .or(references(:mentions, :follows).where(account: account))
+        .left_outer_joins(account: :followers).left_outer_joins(:mentions).group(:id)
     end
 
     def as_public_timeline(account = nil, local_only = false)