title: Qt Icon not shown on Linux
body: <p>I am trying to make my app (FlatSiteBuilder) show an icon on the taskbar on Ubuntu.
  A small demo app is doing that correctly using the following code.</p>
  
  <pre><code>QApplication a(argc, argv);
  a.setWindowIcon(QIcon(QLatin1String(":/images/icon.svg")));
  </code></pre>
  
  <p>But when I try to do this in my app only the QuestionMarkIcon is shown.<br>
  When I try to change the TARGET of my demo app to FlatSiteBuilder in the .pro file the icon is not shown anymore.<br>
  When I try to change the TARGET of my demo app to Gimp for example then the Gimp-Icon is shown.</p>
  
  <p>Where is the information stored that Ubuntu is showing the Gimp-Icon?<br>
  Where is the information stored that Ubuntu is not showing an Icon for FlatSiteBuilder?</p>
  
  <p>My .pro file<br>
  <code>TARGET = IconTest</code> -> shows the correct icon<br>
  <code>TARGET = IconTest2</code> -> shows the correct icon<br>
  <code>TARGET = FlatSiteBuilder</code> -> shows the questionmark icon<br>
  <code>TARGET = Gimp</code> -> shows the Gimp icon</p>