Inconsistency in setInputMethodHints behavior

It seems that QWidget::setInputMethodHints and QGraphicsItem::setInputMethodHints behave in inconsistent way. QWidget's version calls QInputContext::update(), while QGraphicsView's version doesn't. QWidget's version suggests that input method hints are something that can change while an editor is focused and we should react to it on input context side but QGraphicsView's version suggests that it isn't. Which one is correct?