While floats are not part of the inline content and they are not supposed to introduce soft wrap opportunity, e.g. [text][float box][float box][text][float box][text] is essentially just [text][text][text] figuring out whether a float (or set of floats) should stay on the line or not (and handle potentially out of order inline items) brings in unnecessary complexity (and apparently Blink works like that too)
Created attachment 414766 [details] Patch
Committed r270151: <https://trac.webkit.org/changeset/270151> All reviewed patches have been landed. Closing bug and clearing flags on attachment 414766 [details].
<rdar://problem/71657211>