Shifts focus to the logical previous widget in the accessible widget hierarchy from the user's currently focused accessible widget based on the current navigation policy. SeeIAccessibleWidget::GetPreviousWidgetInHierarchyfor an explanation of what the logical previous widget in the accessible hierarchy means.FScreenReaderReply::Handled()if focus has successfully shifted to a logical previous widget from the currently focused accessible widget. Else returnsFScreenReaderReply::Unhandled()