Aha, this seems to be a more sensible way of getting screenshots:

Aha, this seems to be a more sensible way of getting screenshots:
instead of having the puzzle binary export its window ID to a script
which then runs xwd, we can use the gdk-pixbuf library to have the
puzzle binary _itself_ read its own internal pixmap and save it
straight to a PNG. How handy. And faster, and less timing-sensitive.

[originally from svn r7022]