[phone] Leaving WiFi coverage often leads to the password dialog being displayed indefinitely

This reminds me of <https://bugzilla.gnome.org/show_bug.cgi?id=680911>: NetworkManager treats several different causes of Wi-Fi disconnection as if they are the fault of an incorrect password.

I just experienced this on two phones running rtm and vivid, I had not seen this before but got two in one day

I added unity8 because the dialog is shown over the greeter, which seems like should be impossible

The password dialog is a notification as any other, if we don't want to ask for the password when locked, the network indicator should make sure of that.

But, why would we do that? What's the issue? When you have indicators on, you can even connect to a new WiFi network, so you need the dialog shown?

Actually the prompt is for the local network that is already connected.
This seems to be a recent regression, I see it 100% of the time as of last week. May not be the same issue originally reported.

I am no longer seeing this in 127 so marking incomplete

Juts saw this again, the issue seems to be that when leaving Wifi coverage and before the phone suspends the connect dialog is created while the screen is off, so when the user resumes the phone it is displayed. But the AP prompted for connection should no longer have been visible in the first place.

Specification updated. <https://wiki.ubuntu.com/Networking?action=diff&rev2=259&rev1=258>

Oops, I got that wrong. This doesn't apply to the dialog for connecting to a hidden network, because we don't know whether it's in range until we try connecting to it. Specification updated again. <https://wiki.ubuntu.com/Networking?action=diff&rev2=260&rev1=259>

Two separate issues in this bug:
one is the password dialog being displayed indefinitely and second is the design/ui change.

Let's use this bug to track the dialog being displayed indefinitely and I will split a new bug for the design/ui work.