In case someone from Open WhisperSystems is listening, please could you implement a UI plugin environment and allow OSS developers to produce "keyboards" for anyone to implement their own preferred features - stickers or classic or neon-80s-retro Of course that's probably waaay more work than the secure enclave was but its cheap to ask :-)

Ok so that is a bit tongue in cheek but just how much of signal is OSS and how much can the community contribute (it seems that adding gif transparency would be one of those items - but really I don't "get" the requirements.