Prevent infinite layout and wallpaper flashing
The original logic would cause mTopFullscreenOpaqueWindowState to be hidden in PhoneWindowManager.finishPostLayoutPolicyLw(), and to be shown in WindowAnimator.updateWindowsLocked() continuously if there is a show-when-locked dialog. The wallpaper would be hidden after the original wallpaper target is hidden, before the new wallpaper target is shown. https://code.google.com/p/android/issues/detail?id=162495 Change-Id: I918e0fa03eec38d9f0c07150c17013c6c21683cb
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