This allows to use a custom font map for parts of the widget hierarchy - this can be used for application-specific fonts.
https://bugzilla.gnome.org/show_bug.cgi?id=751812
e7fe194 GtkWidget: Add custom font map support
docs/reference/gtk/gtk3-sections.txt | 2 +
gtk/gtkwidget.c | 81 ++++++++++++++++++++++++++++++++--
gtk/gtkwidget.h | 12 +++--
3 files changed, 88 insertions(+), 7 deletions(-)
Upstream: git.gnome.org