Ah, yes, good pickup, thanks. Final, final code: :-)
import com.google.gwt.user.client.Command;
private static native final String getVisibilityState()/*-{
return $doc.visibilityState;
}-*/;
private static native final void listenForVisibilityChange(Command onChange)
/*-{
$doc.addEventListener("visibilitychange", $entry(function() {
[email protected]::execute(*)();
}), false);
}-*/;
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