"An otherwise unbreakable sequence of characters may be broken at an arbitrary point if there are no otherwise-acceptable break points in the line." <- keep-all makes the content " otherwise unbreakable"
Created attachment 438593 [details] Patch
Created attachment 438600 [details] Patch
Committed r282738 (241875@main): <https://commits.webkit.org/241875@main> All reviewed patches have been landed. Closing bug and clearing flags on attachment 438600 [details].
<rdar://problem/83287686>