2004-03-28  Michael Natterer  <mitch@gimp.org>

	* app/core/gimpitem.[ch]: added "gboolean removed" to the GimpItem
	struct. Defaults to FALSE. Set it to TRUE in gimp_item_removed().
	Added public function gimp_item_is_removed().

	* app/core/gimpimage-undo-push.c (undo_pop_layer)
	(undo_pop_layer_mask) (undo_pop_channel) (undo_pop_vectors):
	set it to FALSE manually when re-adding something from the
	undo stack.

	* tools/pdbgen/app.pl
	* tools/pdbgen/pdb.pl: don't allow any operation on items which
	are removed from the image (and exist on the undo stack only).
	Fixes bug #138311.

	* app/pdb/channel_cmds.c
	* app/pdb/color_cmds.c
	* app/pdb/drawable_cmds.c
	* app/pdb/edit_cmds.c
	* app/pdb/floating_sel_cmds.c
	* app/pdb/image_cmds.c
	* app/pdb/layer_cmds.c
	* app/pdb/paint_tools_cmds.c
	* app/pdb/parasite_cmds.c
	* app/pdb/selection_cmds.c
	* app/pdb/selection_tools_cmds.c
	* app/pdb/transform_tools_cmds.c: regenerated.