redshift-gtk: use Ayatana AppIndicator3 instead of App Indicator3

[kenhys]

libappindicator was deprecated and it will be removed in the future Debian release.

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=895037

There is a successor API compatible library - Ayatana Indicator.

https://ayatanaindicators.github.io/code/

[CameronNemo]

Thanks for the patch. Does this affect any existing distros which might ship the older library but not the newer one? If so, is there a way to keep compatibility with both?

[kenhys]

Here are current status of Ayatana Appindicator:

Debian 9(old-stable): not available Debian 10(stable): available Ubuntu 16.04(xenial): not available Ubuntu 18.04(bionic): available Ubuntu 19.10(eoan): available Ubuntu 20.04(focal): available

It is ok to migrate Ayatana because it is available on stable release.

If you want to keep compatibility with both, it may better to try (Ayatana Appindicator) and fallback to AppIndicator .

[jonls]

Yeah it seems like it should be easy to try Ayatana first then fallback to the old import since the APIs are supposedly compatible?

[hartwork]

@kenhys applied in Gentoo at https://github.com/gentoo/gentoo/commit/08e2652263307c142cd089cf2355e40f48ee0113 , thanks for the patch!