Bug 225612

Summary:	Don't fire 'loadedmetadata' and 'canplay' events when re-attaching a video track to a MediaStream
Product:	WebKit	Reporter:	Eric Carlson <eric.carlson>
Component:	WebRTC	Assignee:	Nobody <webkit-unassigned>
Status:	NEW ---
Severity:	Normal	CC:	webkit-bug-importer, youennf
Priority:	P2	Keywords:	InRadar
Version:	WebKit Nightly Build
Hardware:	Unspecified
OS:	Unspecified

Description Eric Carlson 2021-05-10 14:12:45 PDT

As noted in https://github.com/w3c/mediacapture-main/issues/453#issuecomment-837051373, if a page:

1. Assigns a MediaStream with an audio track and no video track to a video element.
2. Adds a video track to the MediaStream assigned in step 1.
3. Removes the video track from the MediaStream assigned in step 1.
4. Adds the same video track again to the MediaStream assigned in step 1.

WebKit fires "resize", "loadedmetadata" and "canplay" events on step 4.

readyState should not drop below HAVE_METADATA when the video track is removed, so it should not fire "loadedmetadata" when it is re-added.

Comment 1 Radar WebKit Bug Importer 2021-05-17 14:13:18 PDT

<rdar://problem/78121674>