title: How to style QPushButton's checked state to remove grey dots?
body: <p>I am using Qt 5.3.0. When I apply some background-color on the QPushButton's checked state, the button will be filled with grey dots (over the background color I wanted) when it is checked.</p>
  
  <p>Here is a tiny test program (with qtcreator but it can also be done with coding):
  1, create an qt application
  2, drag in a QPushButton, set it to flat and checkable
  3, add these lines before w.show()</p>
  
  <pre><code>w.setStyleSheet("\
                  QPushButton {   \
                      color:white;    \
                  }   \
                  QPushButton:checked{\
                      background-color: rgb(80, 80, 80);\
                  }\
                  QPushButton:hover{  \
                      background-color: grey; \
                      border-style: outset;  \
                  }  \
                  ");
  </code></pre>
  
  <p>4, run the app and check the button</p>
  
  <p>You'll see the button turns to dotted but I need the checked button to be in solid color as rgb(80, 80, 80).
  Did I miss something?</p>