Work around the flicker on enter PiP for foldables
This is work around for b/311084698 We use to rely on the mIsInStateChange flag to avoid resetting the surface of PiP task, it's broken recently. The windowing mode check here is not ideal but it should be safe to ignore any resetting from UnfoldAnimationController for a Task that's already pinned. Before: http://recall/-/aaaaaabFQoRHlzixHdtY/ahJ6dpKl1ajsaReCX70Wb After: http://recall/-/aaaaaabFQoRHlzixHdtY/cc0H4jAt0KxqzFxzkfVjk7 Flag: NONE Bug: 311084698 Test: Manually following the reproduce steps in bug (cherry picked from https://googleplex-android-review.googlesource.com/q/commit:0e6c31448829cadffecc66aaebc2210d134d240b) Merged-In: I5f60b2da8eaf948145ca61fb21433f5640f1feeb Change-Id: I5f60b2da8eaf948145ca61fb21433f5640f1feeb
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