bug#6871: Please make linum-mode per buffer, not per major mode

[Stefan Monnier]

> Line numbers should work even in multi major mode buffers. Please add
> the following lines to linum.el:

> (put 'linum-overlays  'permanent-local t)
> (put 'linum-available 'permanent-local t)
> (put 'linum-mode      'permanent-local t)

I don't think that's going to be sufficient: you'll probably at least
also want to remove the

        (add-hook 'change-major-mode-hook 'linum-delete-overlays nil t)

I.e. you can't just make some vars permanent-local, you have to adjust
the major mode from "mode-specific" to "permanent-local".


        Stefan