QTableView: Fix selection for reordered or hidden rows/columns

The old code sometimes made incorrect selections when rows or columns were
hidden or moved. It used logical top left and bottom right indexes to create a
selection rectangle. However on moved or hidden cells a wrong rectangle was
made. This fix calculates a simple rectangle without hidden cells and makes use
of the row/column select functionality provided by the selection model, to make
the right selection.

[ChangeLog][QtWidgets][QTableView] Fixed a selection bug when rows or columns were hidden (QTBUG-50171)

Task-number: QTBUG-50171
Change-Id: Id186012af26da7b2051ff5eb1c13e6b7494cca77
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>