> Start with emacs -Q.
> Don't maximize frame.
> Open a file that has more lines than the current frame.
> M-x linum-mode
> Maximize frame.
> Line numbers are only drawn where the original, visible frame boundary
> was.
> Press down arrow key.
> Line numbers are redrawn for the entire frame.

> The same thing happens when narrowing on a function and then widen
> again.  Only the narrowed piece has the new line numbers until the next
> explicit redraw.

You may have more luck with my reimplementation of linum which uses
jit-lock, which hopefully fixes those problems (tho it may come with
others of course).


        Stefan