Subject: bug#78621: Pixelwise display specified spaces less precise than min-width

From: Ship Mints <[email-masked]>
Date: Wed, 28 May 2025 18:15:53 -0400

On Wed, May 28, 2025 at 6:12 PM Jim Porter <[email-masked]> wrote:

> On 5/28/2025 1:40 PM, Ship Mints wrote:
> > But... Did you run the repro in question and it worked for you, or are
> > you saying that this worked for your case?
>
> I edited your repro to use that call (see the diff below), and it all
> looks good to me, as shown in the attached screenshots.
>
> --- before.el   2025-05-28 14:58:33.646686778 -0700
> +++ after.el  2025-05-28 14:58:42.551136757 -0700
> @@ -12,8 +12,7 @@
>       (let ((pad-to-width 150))
>         (cl-labels
>             ((string-pixel-width-scaled (str)
> -             (ceiling (* (string-pixel-width str)
> -                         (/ (float (default-font-width))
> (frame-char-width)))))
> +             (string-pixel-width str (current-buffer)))
>              (insert-pad-to-width (str face)
>                (let* ((s (propertize str 'face face))
>                       (pad-width (- pad-to-width
>

Interesting.  The results got worse for me, not better.

What platform did you test on?