I am using QSqlTableModel + QTableView
Why does the QAbstractItemModel::dataChanged signal fires two times for single cell data change.
- first signal marks single cell changed
- second signal marks entire row

Qt Code: 
  1. debug trace:
  2. onTableDataChanged top.left.ndx(9,5) bottom.righ.ndx(9,5) rules.size=0
  3. onTableDataChanged top.left.ndx(9,0) bottom.righ.ndx(9,10) rules.size=0
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