Bug 1023658 - [User story] Hide CC and BCC fields while composing an ema...

...il
Also, I think some work needs to be done to hide the text box for cc: when closed. I was able to tap to get the cursor in there while cc/bcc was in the closed state, where that should have triggered the open animation.

And for me, the compose card comes up with the cc and bcc card showing, where they should be collapsed. You are probably aware of these things already and are probably just looking for feedback on the actual animation right now, just listing this all out for completeness, and for notes for myself when I look later.

I should mention, I think you are close with the animation, if it is spread out to the longer duration mentioned in the css comment.