Right now because the message's visibility is only manipulated by thesignal handlers that fire when the relevant comboboxes are interactedwith directly.
But when their values are changed indirectly as a result of clickingthe "Defaults" or "Reset" button, that code never runs, so the messagecan remains shown or hidden when it shouldn't.
To fix this, handle the "value changed indirectly" case, too.
BUG: 507352
FIXED-IN: 6.5.0