title: Setting focus on QlineEdit widget
body: <p>I am trying to put together a simple widget where the focus is automatically put to a QLineEdit widget (It is for a barcode scanner input, and I don't want the end users to have to click in the widget).</p>
  
  <p>The relevant code looks like this:</p>
  
  <pre><code>from qtmodern import styles, windows
  from qtpy import QtGui, QtCore
  from qtpy.QtWidgets import *
  from qtpy.QtCore import Qt
  
  class MyGui(QWidget):
      def __init__(self, parent=None):
          super(MyGui, self).__init__(parent)
  
          layout = QVBoxLayout()
  
          self.lineEdit = QLineEdit(self)
          self.lineEdit.setPlaceholderText('foobar')  
          self.lineEdit.setFocusPolicy(Qt.StrongFocus)      
          self.lineEdit.setFocus()
  
          layout.addWidget(self.lineEdit)
  
          self.setLayout(layout)
          self.show()
  
  def main():
      app = QApplication([])
      styles.dark(app)
  
      g = windows.ModernWindow(MyGui())
      g.resize(350,100)
      location = (50, 100)
      g.move(location[0], location[1])
      g.setWindowTitle('SmallTest')
  
      g.show()
      app.exec_()
  
  if __name__ == '__main__':
     main()
  </code></pre>
  
  <p>And it doesn't want to put the focus on the lineEdit widget.  I'm guessing its something really obvious that I've missed, but I've been digging around for a while trying to find it, and haven't stumbled upon it yet.</p>