2005-05-25  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpviewable.[ch]: added virtual function
	GimpViewable::get_size() and public API gimp_viewable_get_size()
	which return width and height and a boolean indicating if the
	viewable has a size at all.
	Added default implementation of GimpViewable::get_popup_size()
	using the new get_size() API.

	* app/core/gimpbrush.c
	* app/core/gimpbuffer.c
	* app/core/gimpdrawable.c
	* app/core/gimpimage.c
	* app/core/gimppattern.c: implement GimpViewable::get_size().

	* app/core/gimpbrush.c
	* app/core/gimppattern.c: removed GimpViewable::get_popup_size()
	implementations, the default one is good enough.

	* app/core/gimpbrushpipe.c (gimp_brush_pipe_get_popup_size):
	redirect to gimp_viewable_get_size() instead of duplicating its
	return values.

	* app/widgets/gimpcontainertreeview.c
	* app/widgets/gimpview.c: allow pixbuf dragging out of any
	viewable that has a size.

	* app/widgets/gimpdrawabletreeview.c: removed pixbuf dragging code
	here.

	* app/widgets/gimpdnd.c: set gimp busy around encoding/decoding
	pixbufs into/from GtkSelectionData, because it can be a time
	consuming operation.