Fix multiple issues with replies collection for pages further than self-replies (#11582)

* Fix the replies collection returning snowflakes ids rather than URIs

Fixes #11568

* Fix min_id in replies queries once self-replies are exhausted

* Fix `next` attribute of replies collection being nil when there are no self-replies

* Rename other_accounts param to only_other_accounts

app/controllers/activitypub/replies_controller.rb

@@ -27,7 +27,7 @@ class ActivityPub::RepliesController < ActivityPub::BaseController
   end
 
   def set_replies
-    @replies = page_params[:other_accounts] ? Status.where.not(account_id: @account.id) : @account.statuses
+    @replies = page_params[:only_other_accounts] ? Status.where.not(account_id: @account.id) : @account.statuses
     @replies = @replies.where(in_reply_to_id: @status.id, visibility: [:public, :unlisted])
     @replies = @replies.paginate_by_min_id(DESCENDANTS_LIMIT, params[:min_id])
   end
@@ -38,7 +38,7 @@ class ActivityPub::RepliesController < ActivityPub::BaseController
       type: :unordered,
       part_of: account_status_replies_url(@account, @status),
       next: next_page,
-      items: @replies.map { |status| status.local ? status : status.id }
+      items: @replies.map { |status| status.local ? status : status.uri }
     )
 
     return page if page_requested?
@@ -55,16 +55,17 @@ class ActivityPub::RepliesController < ActivityPub::BaseController
   end
 
   def next_page
+    only_other_accounts = !(@replies&.last&.account_id == @account.id && @replies.size == DESCENDANTS_LIMIT)
     account_status_replies_url(
       @account,
       @status,
       page: true,
-      min_id: @replies&.last&.id,
-      other_accounts: !(@replies&.last&.account_id == @account.id && @replies.size == DESCENDANTS_LIMIT)
+      min_id: only_other_accounts && !page_params[:only_other_accounts] ? nil : @replies&.last&.id,
+      only_other_accounts: only_other_accounts
     )
   end
 
   def page_params
-    params_slice(:other_accounts, :min_id).merge(page: true)
+    params_slice(:only_other_accounts, :min_id).merge(page: true)
   end
 end

app/serializers/activitypub/note_serializer.rb

@@ -55,7 +55,7 @@ class ActivityPub::NoteSerializer < ActivityPub::Serializer
         type: :unordered,
         part_of: ActivityPub::TagManager.instance.replies_uri_for(object),
         items: replies.map(&:second),
-        next: last_id ? ActivityPub::TagManager.instance.replies_uri_for(object, page: true, min_id: last_id) : nil
+        next: last_id ? ActivityPub::TagManager.instance.replies_uri_for(object, page: true, min_id: last_id) : ActivityPub::TagManager.instance.replies_uri_for(object, page: true, only_other_accounts: true)
       )
     )
   end