Made portable to previous gnome version

[djon2003]

I will add a new feature after this, but I wanted it to be comptabile between the different versions of Ubuntu I have and not adding my feature twice.

[adaxi]

Thank you, I'll test this out!

[adaxi]

Which version should this be backward compatible to?
I have tested this under 3.26 its seems that there are some compatibility issues. I can only see one device in the list, where I would expected to see two.

[djon2003]

Can you tell me your setup please? I will create myself another virtual machine using this configuration.

For your information, up to now, the until thing I did was to extract the common code between v7 and master into the Abstract* class and use a try/catch to first use the latest version otherwise fallback on v7.

Now for me it works on Ubuntu 18.04 with Gnome 3.28.2 (real machine) AND on Ubuntu 20.4 with Gnome 3.36.8 (virtual machine under Windows 10).

[adaxi]

Whoops, looks like have incorrectly checked the version I was testing. I am actually testing under Gnome 3.30.2. I have been testing against my own setup personal setup on Debian Buster (10). On my personal setup I have my onboard audio and an HDMI interface. When I activate your version of the plugin only the onboard setup is shown in the dropdown.

[djon2003]

And with your version you see both? Because I also have multiple HDMI outputs which were never seen even before doing my changes (if I recall correctly).