Track changes in FontMaps using a serial

This adds the pango_font_map_get_serial method that lets you see
if a fontmap has changes since the last check. It adds implementations
to all current fontmaps.

https://bugzilla.gnome.org/show_bug.cgi?id=340066

1 files changed, 1 insertions, 0 deletions

diff --git a/pango/pangocairo-fc.h b/pango/pangocairo-fc.h
index ea4fccbc..8873d5b3 100644
--- a/pango/pangocairo-fc.h
+++ b/pango/pangocairo-fc.h
@@ -37,6 +37,7 @@ struct _PangoCairoFcFontMap
 {
   PangoFcFontMap parent_instance;
 
+  guint serial;
   double dpi;
 
   FT_Library library;