2004-02-01  Michael Natterer  <mitch@gimp.org>

	Disallow to rename the layer mask. Instead, always name the mask
	"<layer name> mask". Fixes bug #133112 along with some other
	unreported ones.

	* app/core/gimpitem.[ch]: added a boolean return value indicating
	success to GimpItem::rename().

	(gimp_item_real_rename): push an undo step only if the item is
	attached.

	* app/core/gimplayer.c (gimp_layer_rename): refuse renaming if
	the layer is a floating selection floated from a channel
	(renaming a layer's floating selection makes a new layer out
	of the floating selection).

	(gimp_layer_duplicate): use gimp_layer_add_mask() to attach the
	mask's duplicate. Fixes mask refcount brokenness for duplicated
	layer masks.

	(gimp_layer_name_changed): new function. Automatically renames the
	layer mask when the layer's name changes.

	* app/core/gimplayermask.c (gimp_layer_mask_rename): new function
	which refuses renaming.

	(gimp_layer_mask_name_changed): skip the unique name voodoo
	GimpItem does by not chaining up.

	(gimp_layer_mask_set_layer): change the mask's name whenever it is
	attached to a layer.

	* app/text/gimptextlayer.c (gimp_text_layer_rename): fiddle with
	text_layer->auto_rename only if renaming was successful.

	* app/widgets/gimpitemtreeview.c (gimp_item_tree_view_name_edited):
	restore the old name if renaming failed.

	* tools/pdbgen/pdb/drawable.pdb (set_name): return an execution
	error if renaming failed.

	* app/pdb/drawable_cmds.c: regenerated.