Similar to the existing attachmentElementEnabled, attachmentWideLayoutEnabled should be in WK/Web Preferences to allow clients (who cannot access WebCore::Settings) to set it as needed.
<rdar://problem/105797723>
Pull request: https://github.com/WebKit/WebKit/pull/10537
Committed 260791@main (cb1d57a0fec3): <https://commits.webkit.org/260791@main> Reviewed commits have been landed. Closing PR #10537 and removing active labels.