Freetype try to auto detect PMingLiU font and force unpatented hinting
for rendering (ttobjs.c->tt_face_init). However, for embeded subset
fonts in pdf, it seems that the family name is not saved, instead, only
fontname is preserved. As shown at

<https://bugs.freedesktop.org/show_bug.cgi?id=15301>. 

As a result, pdf file with subset PMingLiU font would not be displayed
properly.




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