[Webkit-unassigned] [Bug 167311] LayoutTest media/modern-media-controls/tracks-panel/tracks-panel-hide.html is a flaky timeout

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=167311

--- Comment #4 from Antoine Quint <graouts at apple.com> ---
This looks like a bug in the TracksPanel class where we register for the "transitionend" event at the same time we apply the "fade-out" class that triggers the transition. But in case the value we're animating from is already 0, we won't have a chance to transition and there will be no event. So we need to register for the event first and delay the transition until the next frame.

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