Well, how about just a link instead of an attachment

http://www.gnome.org/~clarkbw/designs/document-viewer/entry%20completion.png

Created attachment 39604 [details]
Image of completion

Attaching the image for posterities sake

I half wrote this patch, until I ran into trouble with GtkEntryCompletion.  I'm
going to attach the patch I started in case anyone else wants to take it up.  It
needs some work before committing.  In particular:

1) The liberal use of g_object_set_data() is pretty ugly, and hard to use.  It
would make more sense to return a custom widget instead of an HBox for the proxy.

2) I obviously need a better filter function than gtk_true() (-;  I was going to
write this, but was mildly disheartened by sizing issues.

3) We need to keep a GtkPageCache around for the proxy widget.

4) Clean up the iter conversion code.  It's quick-n-dirty right now.

Anyway, if anyone wants to pick this up, that would be great.  It'd be cool to
put it in.

Created attachment 39605 [details] [review]
quick patch to implement this.

Initial broken patch

I finished this off, and gaurded it with an:
if (! gtk_check_version (2, 7, 0) { ... };
so that it will only occur with the next GTK+.  Hopefully it will work well - I
haven't fully tested that yet as GTK+-HEAD doesn't build right now./