Appologies for resurfacing this "old" thread, but I was looking into this issue again to see if the Signal Foundation has made any progress.
As I had an open feature request on their Community page since August 2019 (https://community.signalusers.org/t/sign...64/9001/34).
And the only "trustworthy" source for a Signal Client outside the Foundation I think is the one released by Dennis Ameling (https://github.com/dennisameling/Signal-Desktop) as he works closely with the developers of the Foundation and has their blessing and his stuff gets merged into the official repos too.
Only downside for now is that he only works on the Desktop Client.
As I had an open feature request on their Community page since August 2019 (https://community.signalusers.org/t/sign...64/9001/34).
And the only "trustworthy" source for a Signal Client outside the Foundation I think is the one released by Dennis Ameling (https://github.com/dennisameling/Signal-Desktop) as he works closely with the developers of the Foundation and has their blessing and his stuff gets merged into the official repos too.
Only downside for now is that he only works on the Desktop Client.