Currently we measure and adjust the baseline/line height on each append ([foo][ ][bar] <- 3 times) We can actually do it in one go after we've merged the runs ([foo bar]).
Created attachment 384241 [details]
Comment on attachment 384241 [details]
Clearing flags on attachment: 384241
Committed r252835: <https://trac.webkit.org/changeset/252835>
All reviewed patches have been landed. Closing bug.