title: Wait for an object property to be set in squish
body: <p>I am using Squish 6.3 Qt. The application i am testing contains a <code>QLabel</code> whose content changes dynamically.
  Is it possible to wait for the label to be set to a particular value?
  I can't use <code>waitForObject</code> as the object always exists and only its text value keeps changing.</p>