bug#30582: Line number shifts left when horizontal scrolling with a tab.

[Eli Zaretskii]

> Date: Thu, 22 Feb 2018 12:51:29 -0800
> From: Keith David Bershatsky <esq@lawlist.com>
> 
> Step 1:  Launch Emacs 26
> 
> Step 2:  Switch to the *scratch* buffer.  We should be on line 4, with the 
> default scratch message on the first 2 lines above.
> 
> Step 3:  M-x display-line-numbers-mode
> 
> Step 4:  Type:  C-q TAB Hello-world.
> 
> Step 5:  Evaluate:  (scroll-left 5)
> 
> Observe that the line number of the current line shifts to the left such that 
> it is no longer aligned with the other line numbers.  The same will hold true 
> under a variety of similar circumstances; e.g., line numbers exist below the 
> current line; more than 10 lines exist, etc.

Thanks, should be fixed on the master branch now.