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You are not allowed to track surfaces from GDK or draw outside of expose
events. So we can remove ugly hacks needed previously. See
https://bugzilla.gnome.org/show_bug.cgi?id=606009 for the introduction
of this workaround.

This is in preparation for getting rid of GdkDrawable as a dependency of
GdkWindow.

Also get rid of the GdkDrawable vfunc.

Also remove the vfunc from GdkDrawableClass.

This is not strictly an API change as GdkDrawable is typedeffed to
GdkWindow, but it changes the header, so I'm marking it as such.
gdk_cairo_create() can only be used with windows these days, so it makes
sense to pass a window. With that, we can alseo remove the
set_cairo_clip() vfunc from GdkDrawable and implement it inside
gdkwindow.c.

You should not ever ever ever call cairo_reset_clip(). If you do, your
code is broken and you deserve everything you get.
And we should definitely not support this insanity.

It's not use anymore, the whole functionality has been moved to
GdkWindowImplX11.

on't look at GdkDrawableImplX11->screen, but call
gdk_window_get_screen() instead.

Window equivalents exist and drawables are on their way out.

GDK_WINDOW_XID() instead of GDK_DRAWABLE_XID()
GDK_WINDOW_XDISPLAY() instead of GDK_DRAWABLE_XDISPLAY()

No need for the function. Macros exist to do the same thing.

It's not used anymore

Instead of lots of magic, we can go the usual way of requesting the
XDisplay of the window's display. So we do that.

Also moves the function implementations to gtkwindow-x11.c.

No point in setting the alignment to centre if we don't center it
within the cell itself.

Recent changes cause disposing menus to emit ::deactivate. So better
disconnect the deactivate handler first.

This allows to pre-select a custom item.

Even in case there are no installed applications for our content type.

When setting a GtkRange's upper and lower values to the same
value, the slider will not be drawn any more.

https://bugzilla.gnome.org/show_bug.cgi?id=549720

Thomas Wood pointed out that the original MxGtkLightSwitch widget upon
which I based the behaviour of GtkSwitch was not written by him; the
original authors are:

  Joshua Lock
  Robert Staudinger
  Jussi Kukkonen

My apologies to all of them.