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916053d932
This in effect reverts part of bug 1756400, so that we only do the full per-language fontconfig substitution processing for locales that use CJK or Arabic script. These are the locales where it is likely that there may be custom per-language/locale font preferences that need to be respected. (In theory fontconfig could be set up with per-language rules even for distinctions like 'en-US' vs 'en-GB', or 'en' vs 'fr' vs 'de', etc., and we will no longer respect these. But it is almost vanishingly unlikely that separate font mappings for such distinctions will really be needed, and the cost of doing all the lookups separately for every lang tag, even within simple writing systems like Latin, is excessive.) No automated tests, as this is heavily dependent on the system configuration. Differential Revision: https://phabricator.services.mozilla.com/D162304
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