This method is unused and makes more difficult to unify AttributedString support between Mac and iOS.
<rdar://problem/105469260>
Created attachment 464989 [details] Patch
r+
Committed 260404@main (6c2af5c698e9): <https://commits.webkit.org/260404@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 464989 [details].