bug#28844: 26.0.90; display-line-numbers-mode should call window-configuration-change-hook

[Paul Rankin <hello@paulwrankin.com>]

On Tue, 17 Oct 2017, at 03:44 PM, Eli Zaretskii wrote:
> First, let's be clear about something: it's not "my" mode.  I'll never use it, except
> for testing and fixing bugs.  I implemented this feature because line numbers are
> very popular among Emacs users, and existing solutions, like linum-mode, slow
> down Emacs, sometimes to a crawl.  The excitement expressed by users on Reddit
> when the feature landed, which surprised me, is a clear evidence that the results
> are very satisfactory, as far as users are
> concerned.  So this feature is here to
> stay, and Lisp packages need to adapt (bundled packages already did, AFAIK).
> 
> Next, I *know* that I'm misunderstanding something, but repeating what you
> already said, twice, won't help me understand it.  Please provide more
> details about your application's needs regarding the window layout.

https://github.com/rnkn/olivetti

Here’s the minor mode. Go nuts.

> Given the little that you said until now, would checking the value returned by
> line-number-display-width in a post-command-hook solve your problem?
> If not, please tell why not, and let's take it from there.

No it wouldn’t. I don’t need to run code after every command. Until now, the following hooks have been perfect:

window-configuration-change-hook
window-size-change-functions
after-setting-font-hook
text-scale-mode-hook

n.b. window-size-change-functions only added recently due to 26.x changes.