[Webkit-unassigned] [Bug 232141] AX: Notify about children changed earlier in isolated tree mode

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232141

--- Comment #10 from Andres Gonzalez <andresg_22 at apple.com> ---
We cannot update the isolated tree in AXObjectCache::postNotification because it can be called in the middle of a layout, in which case the render tree is not ready for all the queries accessibility will make, or it can trigger a layout. That's why we have moved most or all notification handling to deferred handlers. This is hinted by the comment in postNotification that reads:

    // Get an accessibility object that already exists. One should not be created here
    // because a render update may be in progress and creating an AX object can re-trigger a layout

updateIsolatedTree may create new AX objects and query for lots of properties that the render tree is not ready to compute.

There may be some properties that could be updated early like some ARIA attributes, because they won't cause any changes to the render tree. But we need to special case those.

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