Privately export this method. It classifies directories and mountables the

Privately export this method. It classifies directories and mountables the

        * gtk/gtkfilesystem.[hc] (_gtk_file_info_consider_as_directory):
        Privately export this method. It classifies directories and mountables
        the same.

        * gtk/gtkfilesystem.c (enclosing_volume_mount_cb): Silently drop
        G_IO_ERROR_ALREADY_MOUNTED error for gvfs backends without visible
        mounts.

        * gtk/gtkfilesystemmodel.c:
        * gtk/gtkfilechooserbutton.c:
        * gtk/gtkfilechooserentry.c:
        * gtk/gtkfilechooserdefault.c: Use the new function instead of
        direct checks for G_FILE_TYPE_DIRECTORY throughout.

svn path=/trunk/; revision=21898