Double key movement in gnumeric's TreeViews

[Jody Goldberg <jody gnome org>]

Keynav in all of Gnumeric's treeviews is confused.  Each arrow
movement moves 2 steps. (eg in the fileselector)

If I remove the following from gnumeric's startup things work.

==========================
	gtk_accelerator_set_default_mod_mask (
		gtk_accelerator_get_default_mod_mask() & ~GDK_SHIFT_MASK);
==========================

It was added it so that things like Ctrl-: would be usable as
an accelerator on keyboards where ':' does not require a Shift.

1) Any idea why this screws things up ?
2) Is this still necessary in gnome2 ?