title: Qt: start editing of cell after one click
body: <p>By default the cell in <code>QTableView</code> starts being edited after double click. How to change this behavior. <strong>I need it to start editing after one click.</strong> </p>
  
  <p>I have set combo-box delegate to the cell. When clicking the cell it only selects it. When double clicking on the cell the <code>QComboBox</code> editor is activated but not expanded. I want it to expand after just one click as if I added <code>QComboBox</code> by <code>setCellWidget</code> function of <code>QTableWidget</code>. I need the same effect by using model-view-delegate. </p>