CMake on QTC 4.12 hardly useable in header files

hunger : change 4d3eea6884c212893eea599d47edec2648e4c266 seems to generate _extra-suffixed project parts in the code model.

The issue is, my QtC seems to default to using them for every file related to a CMake target. Except that they don't have any define / include path / etc... so nothing works, and I don't even have the small icon in the editor header that allows me to switch context for a given file for some reason...

See pictures : extra/extra2 are the things that use the "_extra" project parts and normal/normal2 are the things that I would like to have (and had, before that patch).

Interestingly, this is only the case in header files, source files don't seem to default to these _extra things.