Call bookmarks_check_add_sensitivity(). (shortcut_exists): New helper

Call bookmarks_check_add_sensitivity(). (shortcut_exists): New helper

2004-02-23  Federico Mena Quintero  <federico@ximian.com>

	* gtk/gtkfilechooserdefault.c (list_selection_changed): Call
	bookmarks_check_add_sensitivity().
	(shortcut_exists): New helper function; moved the testing code
	over from bookmarks_check_add_sensitivity().
	(bookmarks_check_add_sensitivity): Check the contents of the
	selection in the file/folder list.  Use shortcut_exists().
	(shortcuts_add_bookmark_from_path): Don't insert the bookmark if
	the path is already in the shortcuts list.
	(add_bookmark_button_clicked_cb): Add the bookmarks from the list
	selection or from the current folder, as appropriate.