[Webkit-unassigned] [Bug 257016] Media recorder produces empty chunks

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=257016

--- Comment #3 from youenn fablet <youennf at gmail.com> ---
In the failing case, CanvasCaptureMediaStreamTrack::Source::canvasChanged returns early because the rendering context needsPreparationForDisplay returns true.
But the document is not observing the canvas so ends up not triggering the code path of HTMLCanvasElement::prepareForDisplay.

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