[gtk/fix-icontheme-invalidation: 9/18] icontheme: Keep a serial

[Matthias Clasen <matthiasc src gnome org>]

commit fe6ef5256b8a4898da3d6661775d2fc90594ee25
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Apr 22 13:47:17 2020 -0400

    icontheme: Keep a serial
    
    This will let us identify when we have to re-lookup
    icons because they may have changed despite the theme
    object being the same.

 gtk/gtkicontheme.c        | 9 +++++++++
 gtk/gtkiconthemeprivate.h | 2 ++
 2 files changed, 11 insertions(+)
---
diff --git a/gtk/gtkicontheme.c b/gtk/gtkicontheme.c
index cce4706c95..4cb92350e5 100644
--- a/gtk/gtkicontheme.c
+++ b/gtk/gtkicontheme.c
@@ -331,6 +331,8 @@ struct _GtkIconTheme
   GList *dir_mtimes;
 
   gulong theme_changed_idle;
+
+  int serial;
 };
 
 struct _GtkIconThemeClass
@@ -1367,6 +1369,13 @@ blow_themes (GtkIconTheme *self)
   self->unthemed_icons = NULL;
   self->dir_mtimes = NULL;
   self->themes_valid = FALSE;
+  self->serial++;
+}
+
+int
+gtk_icon_theme_get_serial (GtkIconTheme *self)
+{
+  return self->serial;
 }
 
 static void
diff --git a/gtk/gtkiconthemeprivate.h b/gtk/gtkiconthemeprivate.h
index 495662d1aa..44225fb57a 100644
--- a/gtk/gtkiconthemeprivate.h
+++ b/gtk/gtkiconthemeprivate.h
@@ -41,4 +41,6 @@ void gtk_icon_paintable_snapshot_with_colors (GtkIconPaintable *icon,
                                               const GdkRGBA    *warning_color,
                                               const GdkRGBA    *error_color);
 
+int gtk_icon_theme_get_serial (GtkIconTheme *self);
+
 #endif /* __GTK_ICON_THEME_PRIVATE_H__ */