title: Coloring QSlider for Particular Range
body: <p>I have a QSlider let us assume it has a range of 0 to 100,</p>
  
  <p>What i need is to color the background of QSlider groove from the range 20 to 80 only.</p>
  
  <p>Below i have added a sample image.</p>
  
  <p><img src="https://i.stack.imgur.com/H1KLX.jpg" alt="enter image description here"></p>