[LMP] Removed a comment.
[Poshuku] Descendent sort order in StorageBackend::LoadHistory().
[Poshuku] Avoid not calling endResetModel().
[Poshuku] Container-agnostic std::min.
[Poshuku] Use QList for history container.
[Poshuku] Properly filter out duplicates.

Speeds up initial history loading like 10x.