emacs minor mode optional argument
With GNU Emacs 21.4.1 and desktop save/restore enabled, loading
"mercurial.el" from ".emacs" breaks Emacs' initialization sequence
when the desktop restore code loads a file under Mercurial control.
The function 'desktop-create-buffer' passes an argument to each
minor mode it activates for the buffer.
%% Should show unknown
? unknown
%% Should show unknown and b removed
R b
? unknown
%% Should show a and unknown
a
unknown