title: Qt Widget Overlays
body: <p>How do I overlay widgets in Qt?</p>
  
  <p>I want to create some widgets and place them out-of-layout, but rather tweak their size and position when some other widget's geometry is changed.</p>
  
  <p>Something like the buttons on the screenshot:</p>
  
  <p><img src="https://img-fotki.yandex.ru/get/4006/goodrone.0/0_2aa7e_f82c79f6_orig" alt="alt text"></p>