How to automatically set transparency with picom-trans for all st terminal windows?

[Dupond]

Hello !

I use Openbox as my window manager.

I set the transparency for the st terminal windows using the following config in my .config/picom.conf file:

opacity-rule = [ "85:class_g = 'st-256color'" ];

But this is inconvenient, since I also have some shortcuts to increase/decrease transparency with picom-trans -c +5 and picom-trans -c -5; and it doesn't work well: since picom-trans is independent from picom.conf it considers that the window transparency is set to 100, so the first time I want to decrease the transparency using my shortcut, picom-trans sets it to 95 instead of 80.

So my question is: is it possible to automatically set the transparency using picom-trans each time I open an st terminal window?

Thanks for your advice!