d8597aa9a5
It is possible for a system app to leave shared user ID by an update. We need to keep track of this in case the upgrade is uninstalled. In this scenario, the shadowed system package will be reinstalled using the original shared UID. This has the side effect of the app ID used by the shared user group being held forever even if no apps is actively using it, because only the app ID is stored in packages.xml, not the sharedUserId name, and we have to use the app ID to link the disabled PackageSetting with the corresponding SharedUserSetting. Test: tracking with b/202993696 Bug: 179284822 Fixes: 201509122 Change-Id: If48aeb7d63daf1ef8bdf06a9d2dd34c1de8603c8