Comment 2 for bug 925427

I've arranged for this message to at least only be displayed if the installer is waiting for user actions (which was always the intent).

mpt suggested hiding the contents of the dark progress section if copying files completes before the user has finished answering all the questions, which would avoid this problem while also avoiding the alternative problem that the user doesn't realise they're supposed to do something because there's still a progress bar on the screen. I'm experimenting with this now.