[Webkit-unassigned] [Bug 218225] New: IntersectionObserverCallback leaks

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218225

            Bug ID: 218225
           Summary: IntersectionObserverCallback leaks
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cathiechen at igalia.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

Created attachment 412400

  --> https://bugs.webkit.org/attachment.cgi?id=412400&action=review

layout test: intersection-observer-callback-leak.html

Like ResizeObserverCallback, the js objects inside IntersectionObserverCallback can not be garbage collected until the page is unloaded.

I tried to create a test of the IntersectionObserverCallback version, while it doesn't show any warnings.
`numberOfIntersectionObservers()` is right, because `IntersectionObserver::disconnect` removes observers from document.
But we can see in "Web Inspector -> Timelines -> Javascript Allocations", jsIntersectionObserver is not collected.

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