I am using Cinnamon with a white panel.
The bluetooth icon is almost invisible when it becomes inactive.
Possible solution: In Korla light (which, I presume, is for light-colored panels) use blue bluetooth icon (eg. ../korla/apps/scalable/bluetooth.svg) when it is active and use a dark icon when it is inactive/disabled.
La Capitaine Icon Theme has different icons for light and dark panels. Something similar can be implemented.
I am using Cinnamon with a white panel. The bluetooth icon is almost invisible when it becomes inactive.
Possible solution: In Korla light (which, I presume, is for light-colored panels) use blue bluetooth icon (eg.
../korla/apps/scalable/bluetooth.svg
) when it is active and use a dark icon when it is inactive/disabled. La Capitaine Icon Theme has different icons for light and dark panels. Something similar can be implemented.