Almost identical to the GJS one, except that creating CanvasPoints
works this time. Quite ugly to use, though.

Everything working, except CanvasPoints/Polylines, and getting/
setting transforms

This commit adds (skip) annotations to the @parent field of all
the C constructors, so that they don't do the ownership trick
and can be annotated (transfer full) in every case. This is actually
a bit pointless since all the constructers use varargs so are
disabled in the introspection GIR anyway...

But hurrah! No more warnings from g-ir-scanner! (Apart from one that
can't be fixed)

	* Add missing annotations
	* Add goo_canvas_points_{g,s}et_point function for
	  manipulating the coord array. This is needed for bindings

This is a hard build-time dependency on GI, which may or may not be desired...

Disable with --disable-silent-builds or make V=1

2011-01-10  Damon Chaplin  <damon@gnome.org>

	    * src/goocanvasimage.c: added "alpha" property. Patch from xapantu
	    plus a few changes.

	    * demo/mv-demo.c:
	    * demo/demo.c: added test for the above for the flowers.

	    * Released GooCanvas 1.90.2

2010-11-03  Damon Chaplin  <damon@gnome.org>

	    * src/goocanvas.c: added goo_canvas_get_preferred_width() and
	    goo_canvas_get_preferred_height() and removed goo_canvas_size_request().

	    * configure.in: depend on GTK+ 2.91.3 for the above.

	    * src/goocanvas.c: switched the get_property/set_property code and
	    added "hscroll-policy" and "vscroll-policy".

2010-10-27  Murray Cumming  <murrayc@murrayc.com>

	    Fix the build with GTK+ 2.91.2, using GtkScrollable.

	    * src/goocanvas.[h|c] (goo_canvas_class_init): Implemeent the GtkScrollable
	    interface, overriding the hadjustment and vadjustment properties, instead
	    of implementing the set_scroll_adjustments vfunc, which was removed from
	    GtkWidget. Likewise remove the set_scroll_adjustments_signal because it
	    is no longer needed.
	    (goo_canvas_get_property), (goo_canvas_set_property): Handle the new
	    properties.
	    (goo_canvas_set_hadjustment), (goo_canvas_set_vadjustment): Replace
	    the old goo_canvas_set_adjustments() function with individual functions
	    because they can be set separately, and to have code that is as similar as
	    possible to, for instance, GtkTextView.

	    * src/goocanvas.c (redraw_static_items_at_position)
	    (goo_canvas_adjustment_value_changed): comment out the calls to
	    gdk_window_process_updates() as they cause flickering when zooming.
	    I'm not sure if we should use something else instead.

	    * Released GooCanvas 1.90.1

	    * src/goocanvas.c: updated the drawing code to work with GTK+ 3.
	    It seems to work now, but it still flickers when zooming in & out,
	    since we can't use our old trick of mapping a temporary window with
	    no background over it while changing the scale.

	    * demo/*.c
	    * src/goocanvas.c (goo_canvas_draw): applied patch from Murray to
	    compile with latest GTK+, with minor changes.
	    Note that drawing doesn't work properly at present.

Note that the generated enum types are called GOO_TYPE_CANVAS_*,
but should really be GOO_CANVAS_TYPE_*.

* src/goocanvas.c (goo_canvas_expose_event): When clearing the background,
  use gdk_cairo_set_source_color() and GtkWidget::base instead of
  gdk_draw_rectangle() and GtkWidget::base_gc. Thanks to Benjamin Otte for
  this code.

	    * src/goocanvas.c (goo_canvas_adjustment_value_changed): fixed call
	    to redraw_static_items_at_position() - was using hadjustment twice.