Code review comment for lp:~vanvugt/unity/fix-742544-trunk

Scary, maybe. But well tested by many nvidia users already who use ppa:vanvugt/unity if you read the bug.

Also, calling nvidia-settings would be MUCH slower than this quick file scan.

I personally vote for my previous suggestion: Remove step 5 and then all the ugly changes can be deleted and replaced by:
primary_ = gdk_screen_get_primary_monitor(screen).