238a948ed0
Use pango_font_description_copy() to make a lossless copy of the original font
instead of doing it using wxWidgets API which is less direct and, in addition,
currently is completely broken as SetXXX() methods don't create the Pango font
description if it doesn't exist as they ought to.
See https://github.com/wxWidgets/wxWidgets/pull/312
(cherry picked from commit dbe2a1c2fd)