Emilio Cobos Álvarez af37b13df9
Bug 1652618 - Ensure UA widgets are attached and detached synchronously. r=smaug ...
This changes the UA widget setup (again). What is going on in this
test-case is that we have a marquee inside a video, two things that have
their own UA widget. Given how the code is currently written, the
runnable to attach and set up the marquee's widget is posted before than
the video one (which is potentially reasonable).
However that means that the marquee one runs before and flushes layout,
and catches the video in an inconsistent state (in the composed doc, but
without a shadow root). That in turn messes up reflow because
nsVideoFrame assumes stuff.
Rather than putting the attach / detach logic in script runners, just
run that bit synchronously, and post only the event async. I audited the
consumers of those events and it seems fine to me, they either already
deal with the possibility of the shadow root being already detached or
they don't care.
For teardown, none of the destructors of the UA widgets rely on the
shadow root being still attached to the element.
Differential Revision: https://phabricator.services.mozilla.com/D84487
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Bug 1649221: Update ChromeUtils.generateQI callers to pass strings. r=mccr8,remote-protocol-reviewers,marionette-reviewers,perftest-reviewers,webcompat-reviewers,geckoview-reviewers,preferences-reviewers,agi,whimboo,Bebe,twisniewski
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