[Webkit-unassigned] [Bug 238184] New: AccessibilityRenderObject::nextSibling should allow parent differences in the presence of display: contents

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238184

            Bug ID: 238184
           Summary: AccessibilityRenderObject::nextSibling should allow
                    parent differences in the presence of display:
                    contents
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: tyler_w at apple.com
                CC: andresg_22 at apple.com,
                    webkit-bug-importer at group.apple.com

AccessibilityRenderObject::nextSibling currently has this logic to return nullptr if the computed sibling has a parent different from `this`:

    // Make sure next sibling has the same parent.
    auto* nextObject = objectCache->getOrCreate(nextSibling);
    if (nextObject && nextObject->parentObject() != this->parentObject())
        return nullptr;

This is problematic in the presence of display: contents since we expect parent object differences due to the way this property affects the render tree.

Concretely, this breaks the firstChild(), nextSibling() iteration we do throughout WebKit, as when we get to an element with display: contents we get a parent mismatch and iteration stops unnecessarily.

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