Trying to "Step into" steps out

1. Install a build of Qt but do not install the sources.
   Do not set up a source path mapping in the Options dialog.
2. Open a project which includes the following lines (taken from qbytearray::testQByteArray1() in tests\manual\debugger\simple\simple_test_app.cpp) and configure it with a kit using the Qt version from step 1:

   QByteArray ba;
   ba += "Hello";
   

3. Set a breakpoint in the second line and let the debugger run up to there.
4. Try to step into QByteArray::operator+=.
   Creator will step out.

Creator should step into the function. If this is not possible because of the missing sources, it should just step over, not out.

gdb handles this situation better.