void (@NotNull AnActionEvent e) { if (!ActionPlaces.DIFF_TOOLBAR.equals(e.getPlace())) { e.getPresentation().setEnabled(true); return; } PrevNextDifferenceIterable iterable = e.getData(DiffDataKeys.PREV_NEXT_DIFFERENCE_ITERABLE); if (iterable != null && iterable.canGoNext()) { e.getPresentation().setEnabled(true); return; } e.getPresentation().setEnabled(false); }