Because I was curious, and before I forget, I poked a bit at sloccount tonight. The modules built by jhbuild in a roughly default 2.12 build include about 3.81M LOC; evo, e-d-s, and gtkhtml2 are 671K of that; a little over a sixth. Those same three modules have around a fifth of the open bugs and a fifth of the open crashers in gnome-core modules in bugzilla. Not far off, really; not what I expected.