title: qtableview text edit
body: <p><br/>
  I'm writing a program with PyQt. I use QTableView to display data.<br/>
  The problem is when I trigger the edit(for example press F2) of a cell, the text in the cell is all selected(highlighted) by default. It's not convenience because I want to modify the text but not rewrite them all.<br/>
  So I want to know if there is any function to change the behavior?<br/>
  <br/>
  Thank you</p>