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Add clarifying comment
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@ -186,7 +186,8 @@ int GuiFontMetrics::width(docstring const & s) const
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#endif
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/* For some reason QMetrics::width returns a wrong value with Qt5
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* with some arabic text. OTOH, QTextLayout is broken for single
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* characters with null width (like \not in mathed).
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* characters with null width (like \not in mathed). Also, as a
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* safety measure, always use QMetrics::width with our math fonts.
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*/
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int w = 0;
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if (s.length() == 1
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