Merge "Call preserveSurfaces when detaching children." into rvc-dev am: 5b72ddd8ed am: 747665d491
Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11712621 Change-Id: I43b6c916a44983cc09211ff1464acd0f8d513e43
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