Metal-backend ANGLE rendering contexts are never lost. MTLCommandBuffers provide a status member that can be checked when completion is signalled. It should be possible to mark error from the onCompletion handler and lose the context.
rdar://109176858
Pull request: https://github.com/WebKit/WebKit/pull/14567
Committed 266377@main (ef391b1f467b): <https://commits.webkit.org/266377@main> Reviewed commits have been landed. Closing PR #14567 and removing active labels.