Created attachment 9773 screenshot of notification area with symbolic icons Symbolic icons are supposed to change colour in dark themes. This works fine for regular panel items, but not for symbolic icons in the notification area. I noticed this from a Python program using app indicator 3. I don't believe that the bug is in app indicator 3, but I don't know how to see what the icon_name is that the notification area requests from the program via DBus.
Created attachment 9774 Python program that exhibits the problem
It would be useful to allow the icons to be styled. As it stands right now I do not see any way to style notification icons at all - they do not get any classes from the application and there is no special class for them otherwise.
The notification area only supports sysmbolic icons since version 4.15.2 and currently needs a panel restart to apply such style changes. Maybe this can be fixed, but I didn't consider it a priority. So patches are welcome!
I also would not consider this a priority. How can I install and use 4.15 under Fedora?
I literally have zero idea because I don't use Fedora. You can either ask someone from the Fedora community or if you only want to test use the xfce-test docker container. Also beware that 4.15 isn't a stable release yet, we're currently working on our next stable 4.16.
OK, I guess then my question is whether anything special needs to be done to compile the 4.15 panel.
I think I have xfce4-panel 4.15.2 installed in 4.14. Is that supposed to work? If so, I'm not seeing the symbolic icons change color when I change from Adwaita to Adwaita-dark.
Hmm, maybe not. I did a restart and the icon has changed color to white (but when I think it shouldn't). I then changed to Adwaita-dark and the icon shows up correctly. So it looks as if the changing is sort of working.
Yup, this sounds like the current limitation with symbolic icon support (requires restart).