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app/services/notification_service.rb

@@ -38,6 +38,8 @@ class NotificationService
         when TOPIC_ADDED_TO_MAP
           next unless TopicPolicy.new(follow.user, entity).show? && MapPolicy.new(follow.user, event.map).show?
           next if follow.user.has_map_open(event.map)
+          # note, the caveat to this fork related code is that no future updates will be sent
+          # either. only the notifications for the initial fork should be squashed like this
           next if event.map.source_id # if map is a fork, send notification for that instead
         when TOPIC_CONNECTED_1, TOPIC_CONNECTED_2
           next unless SynapsePolicy.new(follow.user, event).show?