There are similar problems afflicting the Wire app for Android, which is why
it's still not in F-Droid yet, see:
https://github.com/wireapp/wire-android/issues/5
https://github.com/wireapp/wire-android/issues/233
However, the Wire devs acknowledge it's a problem, and have said that fixing
it is on their ToDo list (just not very high on it). See dev comments near
the bottom of this thread:
https://github.com/wireapp/wire-android/issues/5
Contrast this with the comments of Moxie Marlinspike, God-Emperor in charge
of Signal dev, who has very little respect for the software freedom movement
and thinks that installing via Google Play makes Signal more secure
(*facepalm*). He has explicitly said Signal will never be modified to remove
proprietary dependencies and that he doesn't want it to be in F-Droid. There
was a fork called LibreSignal in F-Droid for a while, but Moxie did
everything in his power to stop those clients connecting to the official
Signal server. Signal is a walled garden run by a person actively hostile to
free code software, and I recommend avoiding it.
