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haikuwebkit/LayoutTests/resize-observer/resize-observer-keeps-eleme...

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Calling unobserve on ResizeObserver should not clear existing observations in active targets https://bugs.webkit.org/show_bug.cgi?id=228693 Reviewed by Chris Dumez. Source/WebCore: The bug was caused by ResizeObserver::removeObservation removing it from the active targets. Note that there is nothing in the specification which alludes to this behavior, and the new behavior is consistent with Firefox and the way IntersectionObserver works: https://drafts.csswg.org/resize-observer/#dom-resizeobserver-unobserve To keep elements alive while they're in the active targets but not in the observation targets, this patch also makes each element of the active observation as opaque roots of ResizeObserver in ResizeObserver::isReachableFromOpaqueRoots. Test: resize-observer/resize-observer-keeps-element-of-queued-entry-alive.html * page/ResizeObserver.cpp: (WebCore::ResizeObserver::deliverObservations): (WebCore::ResizeObserver::isReachableFromOpaqueRoots const): (WebCore::ResizeObserver::removeObservation): LayoutTests: Added a regression test. * resize-observer/resize-observer-keeps-element-of-queued-entry-alive-expected.txt: Added. * resize-observer/resize-observer-keeps-element-of-queued-entry-alive.html: Added. Canonical link: https://commits.webkit.org/240178@main git-svn-id: https://svn.webkit.org/repository/webkit/trunk@280551 268f45cc-cd09-0410-ab3c-d52691b4dbfc
2021-08-02 20:03:15 +00:00
This tests observing an element with an ResizeObserver and removing the element from the document while it is queued for delivery.
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
PASS - ResizeObserver wrapper is alive
Done