refreshGroupThread method
Implementation
Future<List<ModeratorEntry>?> refreshGroupThread(String shortLink) async {
ModeratorEntry? target = findModeratorEntryByShortLink(shortLink);
final r = await homeSite?.refreshGroupThreadViaHTTP(shortLink);
//if offline, get local
if (r == null) return threadByShortLink(shortLink);
_tbsCache.clear();
return r;
}