We only need to rebuild the panel's box if yoga or our parent position changed Add checker for HasNewLayout Don't try to cache null packages Fix transitions causing recursive selector checks Speed up HasClasses Refactor Panel system so PreLayout only recurses when it really really needs to Only call FinalLayout if we need to https://files.facepunch.com/garry/8df37b66-e43c-4c46-9123-022f6888b7e7.png Fix backwards compatibility