[Webkit-unassigned] [Bug 238460] New: AX: Don't detach children in AXIsolatedTree::applyPendingChanges for nodes being updated (removed and added)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=238460

            Bug ID: 238460
           Summary: AX: Don't detach children in
                    AXIsolatedTree::applyPendingChanges for nodes being
                    updated (removed and added)
           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

In AXIsolatedTree::updateNode, we perform the update by queuing the node to be removed, and then queueing it to be added.

When performing the removal in AXIsolatedTree::applyPendingChanges, we call AXCoreObject::detach, which unconditionally calls AXCoreObject::detachRemoteParts. Specifically, AXIsolatedObject::detachRemoteParts detaches all the object's children from the itself (by setting their m_parentID to zero). Then, when we start applying m_pendingAppends, we re-add the object, but never re-attach the children, resulting in a broken tree.

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