the voice notes duration.
Specifically:
- start a voice note
- hold to ear until complete
- remove from ear
- start another voice note (or the same one) with the phone away from your ear
You'd expect audio to play through the external speaker, but instead it comes
through the earpiece.
Based on the added logging, this seems to be an apple bug.
Multiple overlapping activities require proximity monitoring (namely,
CallViewController and listening to audio messages).
These activities can overlap arbitrarily, so we use a reference counting
strategy to keep proximity monitoring on as long as one of these activities is
active.
