The timeline header is too small for long configuration names.
Created attachment 374485 [details] Patch
It's not clear from the existing code, because Zhifei has not yet landed his shared css changes that this depends on, but by default, timeline headers are 140px wide, but they allow scrolling.
Comment on attachment 374485 [details] Patch Clearing flags on attachment: 374485 Committed r247691: <https://trac.webkit.org/changeset/247691>
All reviewed patches have been landed. Closing bug.
<rdar://problem/53407079>