title: list filtering with qcombobox and qlineedit
body: <p>I have a question on how to filter items from a ListWidget via combobox selection</p>
  
  <p>Example, in my ListWidget, there are Yellow 01, Yellow 02, Blue 01, Red 01, Red 02 and Red 03
  Whereas in my combobox, there are Yellow, Blue and Red</p>
  
  <p>I guess, you got the gist of it, where if user selects the option Red in the combobox, the ListWidget will displays Red 01, Red 02, Red 03... And the same goes for the other 2 options.</p>
  
  <p>Can someone guide me in this matter?</p>
  
  <p>By the way, out of curiosity, can it be done if I were to integrate another text field (QLineEdit), 3 items in total and have it work the same functions as the combobox as well?</p>
  
  <p>P.S: My Information is reading from a directory and hence it is a little tricky, i guess</p>