Cannot step into functions in Qt header

1. Open the "simple" manual test from Creator's source repository.
   It's in tests\manual\debugger\simple\CMakeLists.txt
2. Have a breakpoint in line 1112:

           pain.drawLine(2, 2, 130, 130);
           pain.drawLine(4, 2, 130, 140);
           pain.drawRect(30, 30, 80, 80);
   

   These functions are defined (not just declared) in QtGui\qpainter.h as you can verify by pressing F2, so installing Qt's sources should not be needed.

3. Run this in the debugger until the breakpoint is being hit.
4. Press F11 to "step into".
   Creator steps over the lines, one by one.

Instead, Creator should step into the function and show qpainter.h.