
Apps that are built as part of the ROM and signed by the platform keys should very rarely be swapped. This removes them from the default list by comparing the signing keys. This filter is deliberately only included on the list function and not on the search function. If people want to share system apps, they'll be able to find them with the search function, but the system apps won't show up by default. https://source.android.com/devices/tech/ota/sign_builds#certificates-keys closes #440