title: When QComboBox is set editable
body: <p>The code below creates QComboBox and QPushButton both assigned to the same layout. Combobox is set to be editable so the user is able to type a new combobox item's value. 
  If the user hits <strong>Tab</strong> keyboard key (instead of Enter) the New Value will not be added to the ComboBox. 
  Question: How to make sure the ComboBox's items are updated with the New Value even if the user leaves the ComboBox with <strong>Tab</strong> key?</p>
  
  <p><a href="https://i.stack.imgur.com/wPZPN.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/wPZPN.png" alt="enter image description here"></a></p>
  
  <pre><code>from PyQt4 import QtGui
  
  def comboActivated(arg=None):
      print '\n ...comboActivated: %s'%arg
  
  widget = QtGui.QWidget()
  layout = QtGui.QVBoxLayout()
  widget.setLayout(layout)
  combo = QtGui.QComboBox()
  combo.setEditable(True)
  combo.addItems(['One','Two','Three'])
  combo.activated.connect(comboActivated)
  layout.addWidget(combo)
  layout.addWidget(QtGui.QPushButton('Push'))
  widget.show()
  </code></pre>