Did a refactor to better organize the camera flipping code. Also, I
wanted to make sure we handle the cases where the user doesn't have two
cameras (or no cameras, for that matter). In these cases, we just don't
show the appropriate buttons.
This was a holdover from Signal's origins as a pure SMS app.
It causes problems, depends on undefined device specific behavior,
and should no longer be necessary now that we have all the
information we need to E164 all numbers.
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If Camera2Enumerator.isSupported() throws, consider Camera2Enumerator to
not be supported, log the Throwable, and use Camera1Enumerator instead.
Before this patch, an exception thrown by Camera2Enumerator.isSupported
would crash any Signal call (even if video was not enabled).
Fixes#6537
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Attempts to:
1) Successfully play ringtone through speaker instead of earpiece
when possible.
2) Manage bluetooth headset connectivity as well as possible
3) Eliminate notification sounds while in-call when possible
4) Make sure audio is correctly setup when receiving calls
Fixes#6271Fixes#6248Fixes#6238Fixes#6184Fixes#6169
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