Problems with vi-goto-mark and vi-set-mark

["Felix Rosencrantz" <f.rosencrantz@xxxxxxxxx>]

I've recently been trying to use viins/vicmd mode.  I've hit a small
problem with the vi-set-mark and vi-goto-mark, they seem to be broken
in the latest version of zsh.  Though it looks like it was working in
4.2.5.

To reproduce:
zsh -f
% bindkey -v
% echo <ESC>maiabcdef
  # ESC changes to vicmd mode
  # ma    creates mark 'a' at the position
  # i   go back to viins mode
  # abcdef    actually doing self-inserts
% echo <ESC>`a
   # <ESC> changes to vicmd mode
   # `a   is suppose to go to mark 'a' from the previous line, but in
the latest version it doesn't seem to work.  It look like it has been
broken for more than a year in 4.3.0

-FR.