bug#13443: 24.2.92: C-<space> with linum-mode enabled hides line numbers

[Alan Mackenzie]

Emacs-24.2.92

emacs -Q

1. Visit a file of non-trivial length in a window.
2. Scroll to a point distant from the beginning-of-buffer.
3. M-x linum-mode.  Line numbers are now displayed.
4. M-<
5. C-<space>
    The line numbers are now not displayed.
6. Perform any command which moves point.
    The line numbers are displayed again.

This lack of line number display after 5 must surely be a bug.  This
behaviour is observed both under X11 and in a Linux tty.

-- 
Alan Mackenzie (Nuremberg, Germany).