When seeking a MSE-backed video element, occasionally the incorrect frame will be displayed briefly in the middle of the seek, before ending on the correct flame.
<rdar://89387951>
Pull request: https://github.com/WebKit/WebKit/pull/1250
Committed r295253 (251301@main): <https://commits.webkit.org/251301@main> Reviewed commits have been landed. Closing PR #1250 and removing active labels.