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bug#19889: bug#22207: emacs-25 mishandles info code text on Fedora 23

From: Paul Eggert
Subject: bug#19889: bug#22207: emacs-25 mishandles info code text on Fedora 23
Date: Fri, 6 May 2016 08:59:48 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.0

On 05/05/2016 11:49 PM, Eli Zaretskii wrote:
If we are going to use such kludges, why not specify fonts explicitly
in the defface to begin with?  After all, that's what your patch
attempts to do, albeit indirectly, right?

The patch I proposed basically implements the suggestions Stefan made in <http://bugs.gnu.org/19889#6> and <http://bugs.gnu.org/19889#24>. Stefan was responding to Glenn’s original bug report, which suggests that it is not a good idea for a face definition to specify a font explicitly, due to portability problems on systems lacking the font. See the attachment to <https://bugzilla.redhat.com/684797> for an example of how verbatim text in TeX mode was displayed as little black boxes because TeX mode specifies an explicit font on a platform lacking it.

I am by no means an expert on Emacs fonts or on font technology in general. That being said, I would like to fix this blocking bug, and Stefan’s suggestion was the only concrete one on the table. If the patch is problematic, then is there a better way to fix this bug? More specifically: is it the introduction of ‘fixed-pitch-serif’ that you’re objecting to, or the addition of FreeMono and Nimbus Mono L as fonts to look for, or is it something else? Is there some way we could make the patch less kludgy, while still addressing Glenn’s and Stefan’s concerns?

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