[gnome-shell] st-theme-context: Make icon theme changes a bit more efficient

[Jasper St. Pierre <jstpierre src gnome org>]

commit 00091a2acb40a3237b9abf90fbc42ffd010c7780
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Wed Apr 4 16:13:07 2012 -0400

    st-theme-context: Make icon theme changes a bit more efficient
    
    There's no need to destroy and recreate the root node for an icon theme
    change. Just emit the CHANGED signal.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=673512

 src/st/st-theme-context.c |   13 ++++++++++---
 1 files changed, 10 insertions(+), 3 deletions(-)
---
diff --git a/src/st/st-theme-context.c b/src/st/st-theme-context.c
index 6fe5fb7..0e96cdb 100644
--- a/src/st/st-theme-context.c
+++ b/src/st/st-theme-context.c
@@ -130,12 +130,18 @@ on_stage_destroy (ClutterStage *stage)
 }
 
 static void
+emit_changed (StThemeContext *context)
+{
+  g_signal_emit (context, signals[CHANGED], 0);
+}
+
+static void
 st_theme_context_changed (StThemeContext *context)
 {
   StThemeNode *old_root = context->root_node;
   context->root_node = NULL;
 
-  g_signal_emit (context, signals[CHANGED], 0);
+  emit_changed (context);
 
   if (old_root)
     g_object_unref (old_root);
@@ -148,8 +154,9 @@ on_icon_theme_changed (StTextureCache *cache,
   /* Note that an icon theme change isn't really a change of the StThemeContext;
    * the style information has changed. But since the style factors into the
    * icon_name => icon lookup, faking a theme context change is a good way
-   * to force users such as StIcon to look up icons again */
-  st_theme_context_changed (context);
+   * to force users such as StIcon to look up icons again. Don't bother recreating
+   * the root node, though. */
+  emit_changed (context);
 }
 
 /**