Avoid showing windows from disposables when they are being preloaded

[ben-grande]

The problem you're addressing (if any)

The preloaded disposable feature starts qubes, but if their template has an application that autostarts, the application is show before it should (before qube is paused)

• Preloaded disposables #1512 (comment)

The solution you'd like

I'd like the ability to flip the invisible option during runtime as pausing a preloaded qube can be too late.

From @marmarek comment:

Theoretically there is an "invisible" mode for gui-daemon for situation like this (it was used for very old implementation of DispVM that also kinda preloaded it). But there is no support for flipping it in runtime, gui-daemon needs to be restarted for that, so that's a broader change to use it in this version. Maybe later, I'd say it's okay to ignore this issue for now.

The value to a user and who that user might be

User's won't be confused why a new window pops up and then later the qube is paused, freezing the window contents.

Completion criteria checklist

No response

[ben-grande]

The PR doesn't handle flip invisble mode on runtime, it just create a distinction of preloaded qubes and only start the GUI session for them after the qube is marked as used. Autostarted applications appear only after qube is marked as used.