Hi,
ARIA defines a busy state (see here and here) to suspend assistive technologies notification while loading document contents. It seems to correspond to GTK_ACCESSIBLE_STATE_BUSY on gtk side.
Do gtk and/or Orca support that state as described in the specs? It’s not clear to me when looking at the code.
I had a look at out Text Editor, they used a hack to remove the widget focus during the update. Could this be replaced by setting GTK_ACCESSIBLE_STATE_BUSY instead?