Update to 2.2.0.

Subjective extract of changes:
* Only close dialogs on Escape if they have a cancel button. [James Willcox]
* Add Home/End/Page_Up/Page_Down keybindings for menus [Owen,
  Narayana Pattipati, Marius Andreiana]
* Improved default color scheme [Soeren Sandmann, with advise from
  Tuomas Kuosmanen and Garrett LeSage]
* Make pixmap creation functions take a GdkDrawable not a GdkWindow
  [Kristian Rietveld]
* Support move-resize emulation for all edges. [Matthias Clasen]
* Remove extra selections for ButtonRelease in XInput code
  [Garry Osgood, Owen]
* Support RTL flipping for statusbars [Matthias]
* Use octal escapes rather than literal UTF-8 in strings [Owen]
* Make a lot of read-only data const. [Matthias, Morten Welinder]
* Use g_get_application_name() for default window titles and
  for the title of the client leader window [Owen, Havoc Pennington]
* Complete resize-grippy support, move-resize emulation
  [Anders Carlsson, Matthias Clasen]
* On screen change, recreate the widget's Pango context [Owen]
* Make g_object_set (gtk_settings_get_default (), ...) to override
  settings from XSETTINGS and ~/.gtkrc [Jonathan Blandford]
* Make GtkInputDialog multihead aware [Owen]
* Add a ::screen-changed signal to GtkWidget [Owen Taylor]
* Draw/check menu items insensitive [Soeren, Tim Evans]
* Add ::snap-edge-set-property to GtkHandleBox [Owen, Matthias]
* RTL flipping improvements for GtkHandleBox, GtkMenuItem, GtkOptionMenu,
  GtkCheckMenuItem [Matthias Clasen]
* Handle painting text on dark-colored progressbars [Soeren]
* Sort the input method list in the right click popup [Abigail Brady]
* Don't grab the focus to the default button in a GtkDialog [Daniel Elstner]
* Remove usage of XLookupString outside of GtkIMContextXIM [Owen]
* Handle Shift/Caps/Num_Lock properly for non-Xkb [Owen]
* Add a --screen option to set default screen [Balamurali Viswanathan, Owen]
* Add simple support for startup notification [Havoc Pennington]
* Handle focus indication for check and radio buttons without children
  [Dave Camp, Owen]
* Much work on improve submenu navigation [Soeren Sandmann]
* Add "selected_shadow_type" property for menus [Soeren]
* Add "scrollbar_spacing" style property [Anders Carlsson, Owen]
* Rework GtkPaned keynav [Soeren, Calum Benson]
* Sensitivity and keynav fixes for GtkFileSelection [Muktha Narayan, Owen]
* Removed mnemonics for GtkToolbar Items [Mikael Hallendal]
* Allow themes to set GtkTreeView even/odd row colors [Kristian]
* Add support for separately installed Pixbuf loaders [Matthias Clasen]
* Export gdk_event_new(), discourage stack allocated events [Owen]
* gdk_draw_pixbuf() as better name for gdk_pixbuf_render_to_drawable() [Owen]
* Basic support for RandR extension [Keith Packard, Owen]
* Allow moving paned sliders all the way to the edge [Owen, Darin Adler]
* Add tag_table construct property to GtkTextBuffer [Daniel Elstner]
* gtk_window_set_[default_]icon_from_file [Owen, Havoc]
* Multihead support
* Add GdkDisplay, GdkScreen structures
* Add _for_display(), _for_screen() variants where needed in GDK and GTK+
  (In other cases, make the variants methods on GdkDisplay/GdkScreen
* Adapt GTK+ widgets to be multihead safe
* Allow initialization of GTK+ without opening a display with gtk_parse_args()
* Add multihead support to demos/tests.
* Xinerama support [Erwann Chenede, Matthias Clasen]
* Allow GDK backends to add custom argument parsing [Sven Neumann]
* Add ::keys-changed signal to GdkKeymap, handle keymap changes for keybindings [Owen]
* Add style property for drawing menu items without shadow [Soeren]
* gtk_widget_modify_color_component/font(): Allow clearing
  current modifications. [Owen]
* Add GtkWidget::is_focus, GtkWindow::is_active properties [Owen]
* Some XEMBED changes for standards compliance and Qt compatibility [Owen]
* Improve label behavior when it gets a too small allocation [Soeren]
* Add support for depth 8 StaticColor visuals to gdkrgb [Matthias]
* Theme drawing improvements [Soeren]
* Add types for GtkRowReference, GtkClipboard [Jonathan Blandford, James Henstridge, Owen]
* Use G_TYPE_FLAG_ABSTRACT for abstract types [Matthias]
* Add gtk_menu_shell_select_first() [Owen]
* Add gtk_notebook_get_n_pages() [Havoc Pennington]
* Allow accel_path = NULL for gtk_menu_item_set_accel_path().
* Allow icon sizes to be changed via a GtkSetting [Bill Haneman, Brian Cameron, Owen]
* Improve gdk-pixbuf loader tests [Soeren Sandmann]
* Use iTXT chunks when necessary in PNG image saver [Matthias]
* Add incremental loading for progressive jpegs [Matthias]
* Add load-at-size functionality [Matthias]
* Add a loader for .ANI animations [Matthias]
* Load hotspot for .ICO files [Matthias]
* Add gtk-im-preedit-style/gtk-im-status-style XSETTINGS [Hidetoshi Tajima]

Lots of bug fixes and enhancements.

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