Can't select CMake generator manually

1. Make sure you have no CMake binary in your PATH variable.
2. Start Creator with empty settings, e.g. by passing the parameter -settingspath <empty directory>
3. Go to "Tools" -> "Options..." -> "Build & Run" -> "CMake".
4. Click "Add".
5. Click "Apply".
6. Go to "Kits" tab.
   Creator shows a warning icon for the default kit.
7. Hover the default kit with the mouse.
   In the tooltip you can read that the "CMake Tool is unconfigured". Oh right, we forgot to specify the binary.
8. Go to "CMake" tab.
9. Select the "New CMake".
10. Give the path to a CMake binary.
11. Click "Apply".
12. Go to "Kits" tab.
    Creator shows a stop icon for the default kit.
13. Hover the default kit with the mouse.
    In the tooltip you can read that the "CMake Tool does not support the configured generator".
14. Select the default kit.
15. Try to select a different CMake generator.
    You can't. The combo box contains only "<Use Default Generator>"
16. Click "OK".
17. Go to "Tools" -> "Options..." -> "Build & Run" -> "Kits".
18. Select the default kit.
    You can now select a different CMake generator.

It should always be possible to select a matching CMake generator.