title: Adjusting dropdown in ExtJS combobox
body: <p>I need such combobox, that's it dropdown's width ant that one of input are different <strong>and</strong> dropdown is adjusted to the right edge of the input.</p>
  
  <p>First part is easy - juts set <code>matchFieldWidth</code>  to false and assign <code>listConfig.width = something</code>. But what is the easiest way to perform the adjustment? Here is a picture which illustrates the question.<img src="https://i.stack.imgur.com/Pd1Ec.jpg" alt="enter image description here"></p>