QListview automatic scrolling should consider when the item is not selected

Phenomenon:
QListview sets IconMode and MultiSelection or ExtendedSelection, when the mouse scrolls to the end, if the item is not selected, the viewport will not display the last row, this will confuse the user to think that all are selected

Refer to the video and demo for the steps to reproduce.

hope：

Regardless of whether the item is selected, all items should be displayed when the mouse slides to the end