Is it really necessary that `KDirModel::canFetchMore` always returns false for network folders? !1455 introduced this as a performance improvement, but it breaks the semantics of `canFetchMore` (it should be "Can more data be loaded for this item", not "Will it be fast to load more data for this item"). I stumbled upon this because I'm exposing KDirModel to QML and using it in a Plasmoid with a QML `TreeView` to show a directory tree, and I can't expand any subfolders of a network folder. To me, this looks like the kind of hidden trap that'll cause more headaches in the future, so if it's necessary, I think it should be configurable or, at the very least, documented.