Implemented the virtual method moveRows to allow row movement.
Used it for the case of sorted insertion.
Heavily based on QListModel::moveRows and its unittest.
[ChangeLog][QtWidgets][QTableWidget] Implemented moveRows in model.
When sorting is enabled, setItem() now moves the row to its
sorted position, emitting rowsMoved rather than layoutChanged.
Task-number: QTBUG-69807
Change-Id: I62a150cca4e5b7d982f2359a6d8c248494528cac
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>
(cherry picked from commit f951c11586081efea108ea5b6a7028c672e12c2a)
d5109e4a88