Re: UI glitch with text-scale-increase / text-scale-decrease with linum / nlinum

[Gauthier Segay <gauthier.segay@gmail.com>]

Hello Stefan, thanks for the update.

I tried on this setup:

GNU Emacs 24.4.1 (i686-pc-mingw32) of 2014-10-24 on LEG570

I disabled my theme/font settings (to ensure it doesn't interfere),
patched the file, recompiled the extensions, but I still notice the
same issue happening.

That being said, when I issue M-x text-scale-increase (or decrease)
instead of using ctrl+wheel , it seems to work properly and adjust the
gutter, so I guess this is not necessarily an issue with the
extension.

I'll appreciate if someone can show me how to define my own function
which disables nlinum, calls the text-scale functions and enables
nlinum back; and how to attach that function to the hook.

Thanks.

On Mon, Feb 9, 2015 at 3:57 PM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:
>> (global-set-key (kbd "<C-mouse-4>") 'text-scale-increase)
>> (global-set-key (kbd "<C-mouse-5>") 'text-scale-decrease)
>> The issue is that linum or nlinum doesn't notice the change, the line
>> number gutter doesn'adjust it's width.
>
> Can you test the patch below (for nlinum.el) to see if it solves
> your problem?
>
>
>         Stefan
>
>
> diff --git a/packages/nlinum/nlinum.el b/packages/nlinum/nlinum.el
> index 82e274c..ca15800 100644
> --- a/packages/nlinum/nlinum.el
> +++ b/packages/nlinum/nlinum.el
> @@ -1,6 +1,6 @@
>  ;;; nlinum.el --- Show line numbers in the margin  -*- lexical-binding: t -*-
>
> -;; Copyright (C) 2012, 2014  Free Software Foundation, Inc.
> +;; Copyright (C) 2012, 2014, 2015  Free Software Foundation, Inc.
>
>  ;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
>  ;; Keywords: convenience
> @@ -54,6 +54,7 @@ Linum mode is a buffer-local minor mode."
>    :lighter nil ;; (" NLinum" nlinum--desc)
>    (jit-lock-unregister #'nlinum--region)
>    (remove-hook 'window-configuration-change-hook #'nlinum--setup-window t)
> +  (remove-hook 'text-scale-mode #'nlinum--setup-window t)
>    (remove-hook 'after-change-functions #'nlinum--after-change t)
>    (kill-local-variable 'nlinum--line-number-cache)
>    (remove-overlays (point-min) (point-max) 'nlinum t)
> @@ -63,6 +64,7 @@ Linum mode is a buffer-local minor mode."
>      ;; FIXME: Another approach would be to make the mode permanent-local,
>      ;; which might indeed be preferable.
>      (add-hook 'change-major-mode-hook (lambda () (nlinum-mode -1)))
> +    (add-hook 'text-scale-mode #'nlinum--setup-window nil t)
>      (add-hook 'window-configuration-change-hook #'nlinum--setup-window nil t)
>      (add-hook 'after-change-functions #'nlinum--after-change nil t)
>      (jit-lock-register #'nlinum--region t))
> @@ -71,14 +73,24 @@ Linum mode is a buffer-local minor mode."
>  (defun nlinum--face-height (face)
>    (aref (font-info (face-font face)) 2))
>
> +(defun nlinum--face-width (face)        ;New info only in Emacs>=25.
> +  (let ((fi (font-info (face-font face))))
> +    (when (> (length fi) 11)
> +      (let ((width (aref info 11)))
> +        (if (<= width 0)
> +            (aref info 10)
> +          width)))))
> +
>  (defun nlinum--setup-window ()
>    (let ((width (if (display-graphic-p)
>                     (ceiling
> -                    ;; We'd really want to check the widths rather than the
> -                    ;; heights, but it's a start.
> -                    (/ (* nlinum--width 1.0
> -                          (nlinum--face-height 'linum))
> -                       (frame-char-height)))
> +                    (let ((width (nlinum--face-width 'linum)))
> +                      (if width
> +                          (/ (* nlinum--width 1.0 width)
> +                             (frame-char-width))
> +                        (/ (* nlinum--width 1.0
> +                              (nlinum--face-height 'linum))
> +                           (frame-char-height)))))
>                   nlinum--width)))
>      (set-window-margins nil (if nlinum-mode width)
>                          (cdr (window-margins)))))