bug#45748: 28.0.50; fit-frame-to-buffer ignores leading spaces

[Eli Zaretskii]

> From: Aaron Jensen <aaronjensen@gmail.com>
> Date: Sat, 9 Jan 2021 11:44:46 -0600
> Cc: 45748@debbugs.gnu.org
> 
> diff --git a/src/xdisp.c b/src/xdisp.c
> index 6a4304d194..20e7ca3a1e 100644
> --- a/src/xdisp.c
> +++ b/src/xdisp.c
> @@ -10652,7 +10652,10 @@ DEFUN ("window-text-pixel-size",
> Fwindow_text_pixel_size, Swindow_text_pixel_siz
>   {
>     c = fetch_char_advance (&start, &bpos);
>     if (!(c == ' ' || c == '\t' || c == '\n' || c == '\r'))
> -     break;
> +            {
> +              dec_both (&start, &bpos);
> +       break;
> +            }
>   }

This increments position, then decrements it, which is sub-optimal.

>   {
>     dec_both (&end, &bpos);
>     c = FETCH_BYTE (bpos);
>     if (!(c == ' ' || c == '\t' || c == '\n' || c == '\r'))
> -     break;
> +            {
> +              inc_both (&end, &bpos);
> +       break;
> +            }
>   }

Same here.