Merge branch 'main' into glitch-soc/merge-upstream

Conflicts:
- `app/views/admin/settings/appearance/show.html.haml`:
  Upstream enforced an uniform code style around lambdas, and glitch-soc
  had a different lambda due to its theming system.
  Applied the same code style changes.
- `app/views/settings/preferences/appearance/show.html.haml`:
  Upstream enforced an uniform code style around lambdas, and glitch-soc
  removed some code just after the lambda.
  Applied the same code style changes.

app/lib/feed_manager.rb

@@ -205,6 +205,26 @@ class FeedManager
     end
   end
 
+  # Remove a tag's statuses from a home feed
+  # @param [Tag] from_tag
+  # @param [Account] into_account
+  # @return [void]
+  def unmerge_tag_from_home(from_tag, into_account)
+    timeline_key        = key(:home, into_account.id)
+    timeline_status_ids = redis.zrange(timeline_key, 0, -1)
+
+    # This is a bit tricky because we need posts tagged with this hashtag that are not
+    # also tagged with another followed hashtag or from a followed user
+    scope = from_tag.statuses
+                    .where(id: timeline_status_ids)
+                    .where.not(account: into_account.following)
+                    .tagged_with_none(TagFollow.where(account: into_account).pluck(:tag_id))
+
+    scope.select('id, reblog_of_id').reorder(nil).find_each do |status|
+      remove_from_feed(:home, into_account.id, status, aggregate_reblogs: into_account.user&.aggregates_reblogs?)
+    end
+  end
+
   # Clear all statuses from or mentioning target_account from a home feed
   # @param [Account] account
   # @param [Account] target_account