Merge "Hide searchbox when header protection is on." into sc-dev am: 93068d1c39 am: 23ad64de64

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15058492

Change-Id: I0d4fca8d4414ddb559c239666e6de7b188fc30c6