npostavs@users.sourceforge.net writes:

> Because the hidden "F1" frame clearly isn't actually visible (and we
> don't need to show line numbers on it).  But that just triggers
> Bug#26912 "desktop-clear with emacs as daemon results in error on C-x 5
> 0" even without desktop-clear, so it's not an acceptable solution by
> itself at least.

I've expanded on this approach, it seems to work, though it's possible
I'm overlooking some other place that assumes the initial frame is
visible.