bug#28879: 26.0.90; Narrowed line numbers shown with display-line-numbers-widen

[Andy Moreton]

On Wed 18 Oct 2017, Eli Zaretskii wrote:

>> From: Andy Moreton <andrewjmoreton@gmail.com>
>> Date: Tue, 17 Oct 2017 21:40:16 +0100
>> 
>>  From emacs -Q:
>> 1) Open a lisp file
>>     (setq display-line-numbers-widen t)
>>     M-x display-line-numbers-mode
>> 2) Move point inside a function
>>     M-x narrow-to-defun
>> 3) M-x widen
>> 
>> After (2) the window shows line numbers relative to the start of
>> the buffer, as expected.
>> 
>> After (3), the window shows line numbers starting from 1 for the
>> narrowed region. After the next mouse or keyboard input, the line
>> numbers are displayed normally.
>
> Right.  And if your Emacs is built with --enable-checking (which is
> something I advise for the first couple of pretest of a new release),
> you might be able to trigger an assertion violation by repeating the
> above recipe several times.

Good point - mine was built without it.

> Should be fixed now.  Thanks for reporting this.

Confirmed fixed.