Optimize RoomList sorting

Keep the almost sorted list around and sort by the raw timestamp value
instead of doing the expensive toMSecSinceEpoch conversion.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/RoomList.h b/src/RoomList.h

index a0151f92..d3470666 100644
--- a/src/RoomList.h
+++ b/src/RoomList.h
@@ -100,6 +100,7 @@ private:
         OverlayModal *joinRoomModal_;
 
         std::map<QString, QSharedPointer<RoomInfoListItem>> rooms_;
+        std::vector<QSharedPointer<RoomInfoListItem>> rooms_sort_cache_;
         QString selectedRoom_;
 
         bool isSortPending_ = false;