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/pangocoretext-private.h b/pango/pangocoretext-private.h
index 3e0dafdc..8076eaea 100644
--- a/pango/pangocoretext-private.h
+++ b/pango/pangocoretext-private.h
@@ -51,6 +51,7 @@ struct _PangoCoreTextFontMap
 {
   PangoFontMap parent_instance;
 
+  guint serial;
   GHashTable *fontset_hash;
   GHashTable *font_hash;