This is worth exploring to improve it. The new message list is presented as `Listbox and we're following the Aria Listbox Patter: https://www.w3.org/WAI/ARIA/apg/patterns/listbox/. Each threaded row is presented as `group` with an `aria-expanded="true"` if opened. The macOS screen reader seems to handle that correctly, but NVDA on Windows doesn't. Peter, you're using Orca on Linux, right? We'll see if adopting the `TreeView` pattern improves the accessibility of this area.
Bug 1822057 Comment 5 Edit History
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This is worth exploring to improve it. The new message list is presented as `Listbox` and we're following the Aria Listbox Patter: https://www.w3.org/WAI/ARIA/apg/patterns/listbox/. Each threaded row is presented as `group` with an `aria-expanded="true"` if opened. The macOS screen reader seems to handle that correctly, but NVDA on Windows doesn't. Peter, you're using Orca on Linux, right? We'll see if adopting the `TreeView` pattern improves the accessibility of this area.