Invisible/muted tracks should be more noticeable - dimmed perhaps?

[hellopaul4]

I am auditioning about 10 music tracks for my edit at the moment, and soloing each one as I want to listen to it. It's not immediately obvious which tracks are muted/soloed and which are not, other than by looking at the M and S indicators. It'd be nice if the muted tracks (whether muted because I've set them to Mute or if I've set other track(s) to Solo) appeared dimmer than the 'live' tracks.

The same could also be applied to invisible video tracks.