In X2, if you record multiple takes in a MIDI track and mute the lanes or clips you don't want to hear or see (you just want to keep them as ideas) like this:
 

 
and if you collapse the lanes, the muted clips are still visible like this:
 


So there's no way to hide the muted clips.
How about in X3? If it's still the same, what's your workaround?

(To answer my own question...)
 
No, the muted clips are still visible (and editable), unfortunately.