Bug 127134 – In-band text track cue duplicate detection should use the cue's original content, not its current content

• Status: NEW
• Component: Media

[Brendan Long]

While discussing our duplicate detection behavior for in-band cues on the HTML mailing list, this came up:

> Ok. So existing WebKit behavior will add the cue again if the application
> modified it. That is likely to be surprising to the application developer.
> We definitely need clarification on what the proper behavior should be in
> the spec.

I think the way we should handle this is by comparing cues with the original cue content, not the current cue content, so if we seek backwards and see a cue that already exists, but has been modified, we ignore that cue and just keep the modified one.

[Gary Katsevman]

My old bug https://bugs.webkit.org/show_bug.cgi?id=240549 looks related to this. I would say it's definitely unexpected that the cue shows up again.