GNU bug report logs - #78621
Pixelwise display specified spaces less precise than min-width

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Jim Porter <jporterbugs <at> gmail.com>
Cc: shipmints <at> gmail.com, 78621 <at> debbugs.gnu.org
Subject: bug#78621: Pixelwise display specified spaces less precise than min-width
Date: Sat, 31 May 2025 09:56:33 +0300

> Date: Fri, 30 May 2025 13:01:30 -0700
> Cc: shipmints <at> gmail.com, 78621 <at> debbugs.gnu.org
> From: Jim Porter <jporterbugs <at> gmail.com>
> 
> On 5/29/2025 9:39 PM, Eli Zaretskii wrote:
> > If the string's text is already in a buffer, we have
> > buffer-text-pixel-size and window-text-pixel-size for that purpose.
> > If the text is not in any buffer, then string-pixel-width should do
> > the job, and do it well.  In particular, it strives to turn on/off all
> > the features that affect display as they are in the original buffer
> > (which can be passed to it as an optional argument), and applies all
> > the buffer-local settings that could matter.  This includes face
> > remapping (which is how text-scaling is implemented).
> > 
> > So I still don't understand the nature of the problem.
> 
> The problem was simply that the original script to reproduce the issue 
> didn't pass the optional buffer argument to 'string-pixel-width', so the 
> relevant buffer-local settings (face remapping) weren't used. Instead, 
> the original script tried to approximate the remapping using its own 
> calculations which weren't quite the same as the display engine.

Thanks, now everything is clear.

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