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-win32.h b/pango/pangocairo-win32.h
index 7a71c0a2..33d0ee45 100644
--- a/pango/pangocairo-win32.h
+++ b/pango/pangocairo-win32.h
@@ -38,6 +38,7 @@ struct _PangoCairoWin32FontMap
 {
   PangoWin32FontMap parent_instance;
 
+  guint serial;
   double dpi;
 };