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This patch adds the boolean pref mathml.stixgeneral_operator_stretching.disabled, which defaults to true iff nightly. When the pref is true, stretched operators won’t be rendered with STIXGeneral, because we only use OpenType MATH tables (in fonts that have them) or the generic Unicode table. When the pref is false, we continue to support STIXGeneral for stretched operators, but warn the author in devtools and bump the use counter (up to once per page). This only happens when a stretched operator actually uses STIXGeneral: not when we successfully render the operator with some other font earlier in the font-family stack, and not when STIXGeneral isn’t installed. Differential Revision: https://phabricator.services.mozilla.com/D73833
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