[Webkit-unassigned] [Bug 223962] New: Streams: fix cancel() promise in ReadableStreamTee being resolved twice

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=223962

            Bug ID: 223962
           Summary: Streams: fix cancel() promise in ReadableStreamTee
                    being resolved twice
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattias.buelens at gmail.com

The Streams standard has been updated to handle an edge case where ReadableStreamTee() would attempt to resolve the cancel() promise twice. While similar changes in the past have not resulted in user-visible changes (since implementations must already ignore resolving already-resolved promises), this particular case *does* lead to a behavior change (which is covered by new WPT tests).

See https://github.com/whatwg/streams/pull/1118 for the specification change and https://github.com/web-platform-tests/wpt/pull/28266 for the new tests.

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