From 2c613166771ea9118ebda91c311f11b3462330fb Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Sat, 12 Dec 2015 02:09:01 +0100
Subject: [PATCH] cssnode: Catch case where a style didn't change

Catch the case where a CSS style did not change and don't emit the
style-changed signal in that case.

This saves not only the emission of the signal, but also doesn't cause
invalidation in child nodes, which would previously get a PARENT_STYLE
---
 gtk/gtkcssnode.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/gtk/gtkcssnode.c b/gtk/gtkcssnode.c
index 9df217abe8..ec89634eb3 100644
--- a/gtk/gtkcssnode.c
+++ b/gtk/gtkcssnode.c
@@ -950,17 +950,20 @@ gtk_css_node_set_style (GtkCssNode  *cssnode,
                         GtkCssStyle *style)
 {
   GtkCssStyleChange change;
+  gboolean style_changed;
 
   if (cssnode->style == style)
     return FALSE;
 
   gtk_css_style_change_init (&change, cssnode->style, style);
 
-  g_signal_emit (cssnode, cssnode_signals[STYLE_CHANGED], 0, &change);
+  style_changed = gtk_css_style_change_has_change (&change);
+  if (style_changed)
+    g_signal_emit (cssnode, cssnode_signals[STYLE_CHANGED], 0, &change);
 
   gtk_css_style_change_finish (&change);
 
-  return TRUE;
+  return style_changed;
 }
 
 static void