mfont_selection_priority - Return the font selection priority.
Return the font selection priority. The mfont_selection_priority() function
returns a newly created array of six symbols. The elements are the following
keys of font properties ordered by priority.
Mfamily, Mweight, Mstyle, Mstretch, Madstyle, Msize.
The m17n library selects the best matching font according to the order of this
array. A font that has a different value for a property of lower priority is
preferred to a font that has a different value for a property of higher
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