title: Flutter image preload
body: <p>Is it possible to preload somehow the image on the app start? Like I have an background image in my drawer but for the first time when I open the drawer I can see the image blinks like it is fetched from assets and then displayed and it gives bad experience to me once I see it for the first time other openings of the drawer are behaving as expected because it is cached. I would like to prefetch it on the app load so there is no such effect.</p>