Re: [PATCH] Add support for `ch' and `cw' dimension specifiers for the image

[Eli Zaretskii <eliz@gnu.org>]

> Date: Fri, 29 Mar 2024 09:50:06 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
> 
> On Thu, Mar 28, 2024 at 10:34:32PM +0300, Evgeny Zajcev wrote:
> > чт, 28 мар. 2024 г. в 14:41, Alan Third <alan@idiocy.org>:
> > 
> > > On Thu, Mar 28, 2024 at 01:50:37PM +0300, Evgeny Zajcev wrote:
> > > > Yes, this is intentional, because saying "height of the font" in docs,
> > > when
> > > > font's pixel size is used in code, is misleading and it took me some time
> > > > to understand why image renders smaller then font height if '(1 . em) is
> > > > specified as dimension modifier.  That's why I started using coefficient
> > > > (calculated with `my-em-height-ratio') to `em' specifier
> > >
> > > Does this mean we have em wrong? It should ideally, IMO, be equivalent
> > > to em in a web browser because that seems the most common use Emacs
> > > users will be aware of. If we're using the wrong value then we should
> > > change it.
> > >
> > 
> > Not wrong, but different.
> 
> OK, I understand, thanks. Em should be equivalent to the font's size
> (i.e. 12 points for a 12 point font) so it's good. This is different.
> 
> I'm happy with it if you are, Eli.

Yes, I'm okay with that as well.

Thanks.