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WallpaperStack implements a crossfade when changing backgrounds.
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image is requested, it is created and added to the stack, then
a crossfade transition is made to the new child. The former
visible stack child is then destroyed. And this repeats.
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This draw callback adds a shade mask over the current
image. It is uniform when not Awake, and acquires a
significant gradient vertically framing the unlock dialog
when Awake.
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A monitor-sized child of the stage that is responsible for displaying
the currently-selected wallpaper or appropriate plug-in.
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