GdkGCValues hash keys

[Kevin Ryde <user42 zip com au>]

I mistakenly passed an unknown GdkGCValues key to Gtk2::Gdk::GC->new and
it was quietly ignored.  Is that intentional, or just that hv_fetch is
easier than iterating in XS?

Croaking on an unknown key could be a good way to catch mistakes that
otherwise merely mysteriously not apply an apparent intended drawing
effect.


-- 
... smoked eel, pad thai and pepper ice cream.  (If that strikes
you as a ridiculous mixture, you are not conceited enough to work
in a professional kitchen, where the vile frequently masquerades as
the exotic.)    -- Tony White