[Webkit-unassigned] [Bug 253883] New: [MSE] SourceBuffer.buffered should return the same object if it's not modified

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=253883

            Bug ID: 253883
           Summary: [MSE] SourceBuffer.buffered should return the same
                    object if it's not modified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jean-yves.avenard at apple.com

Per spec, https://w3c.github.io/media-source/#dom-sourcebuffer-buffered

Step 5,
```
5. If intersection ranges does not contain the exact same range information as the current value of this attribute, then update the current value of this attribute to intersection ranges.
6. Return the current value of this attribute.
```

The current value of this attribute should only be modified if it has changed.

However, currently a copy of the attribute is always returned:
https://searchfox.org/wubkat/rev/7a7d33c945c423639d0e625352d98c40411716f2/Source/WebCore/Modules/mediasource/SourceBuffer.cpp#123-124

```
   // 2. Return a new static normalized TimeRanges object for the media segments buffered.
    return m_private->buffered()->copy();
```

seems to be based on an old spec.

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