title: header view when QFileSystemModel is displayed in a QTableView
body: <p>when the contents of the QFileSystemModel is displayed in a QTableView , the alignment of the text in the first row header section is right-aligned ,while the others is left-aligned,I wonder why ?
  <img src="https://i.stack.imgur.com/ohJ9u.jpg" alt="enter image description here"></p>
  
  <p>how to make the alignment of the text in each header section to be left-aligned?</p>
  
  <p>setDefaultSectionSize() seems doesn't work here</p>
  
  <p>my code </p>
  
  <pre><code>import sys   
  from PyQt4.QtGui import *
  from PyQt4.QtCore import *
  
  if __name__ == '__main__':   
  
      app =QApplication(sys.argv)      
      ui =QMainWindow()   
  
      model= QFileSystemModel ()      
      model.setRootPath(QDir.currentPath())  
  
      model.sort(3)
  
      table = QTableView()
      #print(table.verticalHeader().defaultAlignment()) #
      table.verticalHeader().setDefaultAlignment(Qt.AlignRight)
  
      table.setModel(model);   
      table.setRootIndex(model.index(QDir.currentPath())) # 
      ui.setCentralWidget(table)
      ui.resize(800, 600)
      ui.show()      
      app.exec_()
  </code></pre>