title: How to make an extra icon in QLineEdit like this?
body: <p>I would like to implemented a "clean" button like the following screenshot in Qt Creator, the button dwells in QLineEdit, not a single widget</p>
  
  <p><img src="https://i.stack.imgur.com/io6my.png" alt="enter image description here"></p>
  
  <p>Where should I start from ? </p>