it already checks for establishesBlockFormattingContext() (and floats do establish BFCs)
<rdar://problem/59288204>
Created attachment 390175 [details] Patch
The commit-queue encountered the following flaky tests while processing attachment 390175 [details]: editing/spelling/spellcheck-async-remove-frame.html bug 158401 (authors: morrita@google.com, rniwa@webkit.org, and tony@chromium.org) The commit-queue is continuing to process your patch.
Comment on attachment 390175 [details] Patch Clearing flags on attachment: 390175 Committed r256094: <https://trac.webkit.org/changeset/256094>
All reviewed patches have been landed. Closing bug.