Subject: Re: bug#20628: 25.0.50; Incorrect line height for some fonts

From: Eli Zaretskii <[email-masked]>
Date: Sun, 24 May 2015 12:31:12 +0300

> Date: Sun, 24 May 2015 04:20:22 -0400
> From: Clément Pit--Claudel
>  <[email-masked]>
> CC: [email-masked], [email-masked]
> 
> > How about setting the list of fonts to be ignored (assuming Emacs
> > acquires such a capability) -- would that be useful for packages?
> 
> Maybe. The problem is that if a good font is not installed yet, ignoring Latin Modern Math means replacing huge lines with square boxes. I'm not sure which one is best. Ignoring Latin Modern Math may be better because fixing the square boxes then only requires installing a new font (while fixing the line heights requires installing a new font /and/ setting up fontsets in Emacs). But ignoring Latin Modern Math is also more confusing (the symbols will display fine in user's web browsers, but not in Emacs). The unearthing of `face-ignored-fonts' likely makes this an easy change; do you have an opinion either way?

I think it is better top ignore fonts that produce display which is
unacceptable to users.  You can include in the installation
instructions advice on which fonts to install.