The user wants to build the Qt Creator 3.6.0 from the source code against Qt 5.6 beta and she succeeded. However, the font size is much bigger than the system one.

After re-building Qt Creator against Qt 5.5.1 the font size turn back to the normal.

To see the problem please see the screen-shots attached. On the screen-shot named qtcreator2.jpg is expected result in both cases. On the screen-shot named qtcreator.jpg is what actually happens, when Qt Creator is build against Qt 5.6 beta.

Steps to reproduce:
1. Build Qt Creator against 5.6 beta and 5.5.1 and see the difference.