So we deprecated WebKitPluginError and removed all the error types from the new API version. But now it's no longer possible to view media like e.g. https://bug-249844-attachments.webkit.org/attachment.cgi?id=464289. The load fails with WEBKIT_PLUGIN_ERROR_WILL_HANDLE_LOAD. The browser is supposed to ignore it, but can't. This design is unfortunate and I'm not sure what the best way to fix it would be.
Pull request: https://github.com/WebKit/WebKit/pull/8448
Committed 258772@main (cb508f4d82bf): <https://commits.webkit.org/258772@main> Reviewed commits have been landed. Closing PR #8448 and removing active labels.