Preferences API Docs - Misleading Example App Logic

[AlbinoGeek]

Due to the code shown below, the example does not behave as a user might expect.

    go func() {
        time.Sleep(timeout)
        a.Quit()
    }()

https://developer.fyne.io/tutorial/preferences-api

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Effectively, it doesn't matter what you choose in the Select, the program will always close after 10 seconds on first run.

Perhaps, this should be a more visual demonstration, such as choosing a colour and showing the chosen colour on re-launch.