Comment 3 for bug 1826874

And which folder does it actually empty?
I think we did this, because we also use this to empty the junk folder. But the context menu item to empty Junk or Trash shows only on the Junk and Trash folders. Not that this main menu item is active on any folder, but picks up the name of the current folder (but this one won't be emptied), this would be a bug.