Fixed an issue where group children had rounded corners

Children that were close to the clipping boundary before
were not being reset when they were added as a child.
This could happen with auto groups when collapsed or
with heads up notifications.

Change-Id: I873b65da6778840c4542b4324f69d2ec9b5c1dc5
Fixes: 80276391
Test: add autobundleable children while collapsed, observe no corners