Comment 2 for bug 1374939

This patch has something similar https://mail.gnome.org/archives/commits-list/2014-July/msg02062.html

- vte_terminal_set_font_from_string (vte, "monospace");
+ Pango::FontDescription font_desc ("monospace");
+ vte_terminal_set_font (vte, font_desc.gobj());