title: What is the unit of Width() and Height() APIs of a Qt widget?
body: <p>What is the unit of Width() and Height() APIs of a Qt widget? Qt documentation says int -
  Is it points or pixels? Suppose I have developed some Qt Dialog with many child widgets, is it necessary to scale the widgets based on the screen DPI? or Qt takes care of it automatically?</p>
  <p>I know that pixels to points conversion is needed for font sizes. Is it also needed for widgets heights and widths and all other properties like padding, etc?</p>