Status update on client-side-windows branch

[Alexander Larsson <alexl redhat com>]

Last week I've been working madly on the client side windows branch.

I've implemented native child windows using shaped windows and on-demand
creation of native windows. Part of that was also cleaning up the X
backend, removing all the 32bit window coordinate handling.

I've also gone through a lot of the issues found in testgtk, fixing
bugs. The updated list of missing features and broken testcases (much
shorter now) is at:
http://live.gnome.org/GTK%2B/ClientSideWindows

I've tried make install and running standard apps with this branch. Most
stuff seem to work from a quick look, including things like the gnome
panel and nautilus. However there is some issue with firefox, it shows
the UI but the content area is all black.

Today I rebased the branch to latest trunk.

This is a much cleaner and more finished version than last week, and I'd
appreciate if people took a look at it. Especially the various backend
maintainers.