2001-02-26  John Harper  <jsh@eazel.com>

	reviewed by: Michael Engber <engber@eazel.com>

	Fixed bug 6898 (Tree view initialization may be slower than in
	PR3). Instead of instantiating and destroying Nautilus_Metafile
	bonobo objects each time metadata is queried, cache an object
	for each directory:

	* libnautilus-extensions/nautilus-directory-metafile.c
	(corba_object_is_local, corba_object_get_servant): new
	functions. These are ORBit dependent hacks

	(get_metafile): cache the Nautilus_Metafile object in the
	NautilusDirectory. Use the above ORBit hacks to break the
	circular reference when both client and servant are in the same
	process (the servant has always referenced the directory,
	caching the metafile in the directory introduces the cycle)

	* libnautilus-extensions/nautilus-directory-private.h
	(NautilusDirectoryDetails): added field metafile_corba_object

	* libnautilus-extensions/nautilus-directory.c
	(nautilus_directory_destroy): unref the ...