Scroll, crawl's with QTableview in some situation using Track pad

If a widget has multiple table view and it is scrolled using touch pad at some point it starts crawlling. When scroll starts in vertical direction through table view, it scrolls contents of the table perfectly fine but when contents reaches at its end after that it starts crawling virtually zero scroll.

Further if wheelEvent() of tableview is implemented then as expected contents of table does not scroll but if mouse pointer is pointed on header and then scroll enter page does not scroll.

Attached example can reproduces the problem:
To see second problem please do #if 1 in testtablewidget.h and testtablveview.h