Jeff Brown fa2e504087 Avoid unnecessarily redrawing the wallpaper.
Added some logic to ImageWallpaper to avoid redrawing the wallpaper
when it is not necessary.  Even with the resize fixes, we were still
redrawing the wallpaper an extra 5 times due to visibility and
offset changes which had no real effect.

Change-Id: Ifa39b7bb8c0f7a6a41bc81e00cc2159440f529c5
2011-01-23 13:14:23 -08:00
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