Merge commit '55e7c08a83547424024bac311d5459cb82cf6dae' into glitch-soc/merge-upstream

Conflicts:
- `app/models/user_settings.rb`:
  Upstream added a constraint on a setting textually close
  to glitch-soc-only settings.
  Applied upstream's change.
- `lib/sanitize_ext/sanitize_config.rb`:
  Upstream added support for the `translate` attribute on a few elements,
  where glitch-soc had a different set of allowed elements and attributes.
  Extended glitch-soc's allowed attributes with `translate` as upstream did.
- `spec/validators/status_length_validator_spec.rb`:
  Upstream refactored to use RSpec's `instance_double` instead of `double`,
  but glitch-soc had changes to tests due to configurable max toot chars.
  Applied upstream's changes while keeping tests against configurable max
  toot chars.

app/controllers/api/v1/conversations_controller.rb

@@ -19,6 +19,11 @@ class Api::V1::ConversationsController < Api::BaseController
     render json: @conversation, serializer: REST::ConversationSerializer
   end
 
+  def unread
+    @conversation.update!(unread: true)
+    render json: @conversation, serializer: REST::ConversationSerializer
+  end
+
   def destroy
     @conversation.destroy!
     render_empty

app/controllers/api/v1/statuses/histories_controller.rb

@@ -8,11 +8,15 @@ class Api::V1::Statuses::HistoriesController < Api::BaseController
 
   def show
     cache_if_unauthenticated!
-    render json: @status.edits.includes(:account, status: [:account]), each_serializer: REST::StatusEditSerializer
+    render json: status_edits, each_serializer: REST::StatusEditSerializer
   end
 
   private
 
+  def status_edits
+    @status.edits.includes(:account, status: [:account]).to_a.presence || [@status.build_snapshot(at_time: @status.edited_at || @status.created_at)]
+  end
+
   def set_status
     @status = Status.find(params[:status_id])
     authorize @status, :show?