2009-01-26  Michael Natterer  <mitch@gimp.org>

	The GEGL projection does floating selections now:

	* app/core/gimpdrawable.[ch] (struct GimpDrawable): add a couple
	of GeglNodes which are used to create a sub-graph for this
	drawable's floating selection.

	(gimp_drawable_detach_floating_sel)
	(gimp_drawable_attach_floating_sel): new functions to call
	whenever a floating selection gets attached or detached.

	Change the role of the drawable's "source_node": it's no longer a
	direct tile source but an arbitrary graph. Add new internal
	function gimp_drawable_sync_source_node() which creates a
	sub-graph for the floating selection within the source node, and
	uses the new "tile_source_node" directly otherwise. Connect to
	"notify" of the floating selection and reconfigure its sub-graph
	when its properties change. This is also one more refactoring in
	the direction of layer trees.

	* app/core/gimpfloatingselundo.c
	* app/core/gimpimage.c
	* app/core/gimplayer-floating-sel.c: call the new attach/detach
	API whenever a floating selection is attached or detached from a
	drawable. This will need more refactoring i guess...


svn path=/trunk/; revision=27961