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There's a tool to see if we forgot to update the gdk_settings_map
array, or got the offsets wrong. Mention those above the XSettings
list.

gdk_settings_map needs to be updated when gdk_settings_names is changed,
and it's easier to add the setting at the end, so we don't need to
recalculate everything.

Really fixing:
https://bugzilla.gnome.org/show_bug.cgi?id=634697

But to the related sections of Pango manual

http://developer.gnome.org -> http://library.gnome.org

In this case, gnome-terminal sets an RGBA visual on its window,
and we need to be careful when creating the icon pixmap, to create
the pixmap with the same depth as the visual, or we risk a BadMatch
from XRenderCreatePicture deep inside cairo.

Otherwise the blink timeout is the one used by default in GTK+.

https://bugzilla.gnome.org/show_bug.cgi?id=634697

The gdk-pixbuf VC project files are gone, so don't reference
them from Makefile.am anymore.

We need to link against gdk/libgdk-x11-3.0.la, not
gdk/x11/libgdk-x11.la, which is the convenience library containing
the backend functions.

This returns a GtkBox now, not a GtkVBox.
Language bindings may need to adjust their APIs accordingly.

Set default directory to G_USER_DIRECTORY_DOCUMENTS
when printing to file backend and fallback to the current
directory when it is not available (#633896).

GDK-Pixbuf is in a package of its own, so remove the project files from here

-removed headers that ceased to exist
-bump API version
-made up for new headers that is to be installed
-gtk-demo program and related sources/data copied to bin/gtk3-demo