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Bug 1283754 - Part 3: Add setupSynchronousObserver to write synchronouse tests for MutaionObserver. r=boris
MozReview-Commit-ID: 1sV5QHVeEyw --HG-- extra : rebase_source : 766a282f486a9b68c53771a7d56de3fe659b57ca
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@ -186,3 +186,23 @@ if (opener) {
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opener.done();
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}
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}
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/**
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* Return a new MutaionObserver which started observing |target| element
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* with { animations: true, subtree: |subtree| } option.
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* NOTE: This observer should be used only with takeRecords(). If any of
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* MutationRecords are observed in the callback of the MutationObserver,
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* it will raise an assertion.
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*/
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function setupSynchronousObserver(t, target, subtree) {
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var observer = new MutationObserver(records => {
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assert_unreached("Any MutationRecords should not be observed in this " +
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"callback");
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});
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t.add_cleanup(() => {
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observer.disconnect();
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});
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observer.observe(target, { animations: true, subtree: subtree });
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return observer;
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}
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