I’m using this package.

https://github.com/Malabarba/smart-mode-line <https://github.com/Malabarba/smart-mode-line>

> On Jun 12, 2016, at 2:50 PM, Alan Third <alan@idiocy.org> wrote:
> 
> On Sun, Jun 12, 2016 at 10:53:06PM +0300, Eli Zaretskii wrote:
>>> From: James Nguyen <ja.nguyen@gmail.com>
>>> Date: Sun, 12 Jun 2016 11:03:50 -0700
>>> 
>>> https://dl.dropboxusercontent.com/u/11400324/numberbug.mov
>> 
>> I cannot play this.  Any chance to get some more popular format?  An
>> image is enough, no need for a movie.
> 
> I've attached a screenshot from the movie. It looks like there's some
> custom modeline stuff going on that draws the line-number at the
> extreme left. If the number gets large enough it overflows into the
> fringe where it's then left because that particular part rarely gets
> redrawn.
> 
> It looks to me like there are two problems:
> 
> 1. Whatever is writing the number shouldn't be trying to draw that
>    far left.
> 
> 2. That part of the screen shouldn't be writable. I recently fixed a
>    problem with the cursor intruding into the fringe. I expect this
>    is similar.
> 
> I'll have a look into number 2, but I don't know where to start with
> number 1.
> -- 
> Alan Third
> <Screen Shot 2016-06-12 at 22.39.48.png>