QFileSystemModel not updated when USB removed

• Use QFileSystemModel as a QTreeView model.
• Set drivelist to the rootpath.
• Plug USB drive and see it's correctly updated to the treeview.
• Unplug USB.
  Expected: Drive is removed from the model and vanished from the treeview
  Result: Drive icon is vanhished but drive and content is still visible

Plugging and unplugging drive needs updating model. Adding new roopath works but removing existing index doesn't update the model and treeview.