[Webkit-unassigned] [Bug 205386] New: [css-flex][css-grid] Out-of-flow boxes should not be children of anonymous items

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=205386

            Bug ID: 205386
           Summary: [css-flex][css-grid] Out-of-flow boxes should not be
                    children of anonymous items
           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: rego at igalia.com
                CC: bfulgham at webkit.org, jfernandez at igalia.com,
                    obrufau at igalia.com, rego at igalia.com,
                    simon.fraser at apple.com, zalan at apple.com

This is causing that WebKit fails the following WPT tests
(they pass in Chromium and Firefox):
* http://w3c-test.org/css/css-flexbox/anonymous-flex-item-004.html
* http://w3c-test.org/css/css-grid/grid-items/anonymous-grid-item-001.html

This was already fixed in Chromium:
https://chromium-review.googlesource.com/c/chromium/src/+/895844/
But the code in WebKit regarding tree construction is different now,
so it cannot just be ported directly into WebKit.

There's also a related test that only passes in Firefox right now:
http://w3c-test.org/css/css-flexbox/anonymous-flex-item-005.html

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