Right now, the tracks panel simply overflows when there is a lot of content.
Created attachment 303514 [details]
*** Bug 169200 has been marked as a duplicate of this bug. ***
Comment on attachment 303514 [details]
Clearing flags on attachment: 303514
Committed r213454: <http://trac.webkit.org/changeset/213454>
All reviewed patches have been landed. Closing bug.