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.

git-svn-id: svn://svn.tartarus.org/sgt/puzzles@7022 cda61777-01e9-0310-a592-d414129be87e