Merge "Make a copy of the TaskFragmentContainer list." into main am: c876ccc7fa am: 07bf404f89

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3249678

Change-Id: I22edb95bd4471c7140ff0f1c90c58b6126d68c65
Signed-off-by: Automerger Merge Worker <[email protected]>