From 4141a7d7c8a949585d5bfdc997c7651c5e3fc49f Mon Sep 17 00:00:00 2001
From: Benjamin Otte <otte@redhat.com>
Date: Mon, 9 Nov 2015 01:38:39 +0100
Subject: [PATCH] csstypes: Propagate NTH_CHILD and NTH_LAST_CHILD to siblings

Otherwise, we'd have to mark eveyr child on changes, and it's far easier
to do that once we actually validate.
---
 gtk/gtkcsstypes.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/gtk/gtkcsstypes.c b/gtk/gtkcsstypes.c
index e14ab2ce1c..2e93cbca56 100644
--- a/gtk/gtkcsstypes.c
+++ b/gtk/gtkcsstypes.c
@@ -34,11 +34,16 @@ _gtk_css_change_for_sibling (GtkCssChange match)
                     | GTK_CSS_CHANGE_NTH_LAST_CHILD \
                     | GTK_CSS_CHANGE_STATE )
 
+#define KEEP_STATES ( ~(BASE_STATES|GTK_CSS_CHANGE_SOURCE|GTK_CSS_CHANGE_PARENT_STYLE) \
+                    | GTK_CSS_CHANGE_NTH_CHILD \
+                    | GTK_CSS_CHANGE_NTH_LAST_CHILD)
+
 #define SIBLING_SHIFT 8
 
-  return (match & ~(BASE_STATES|GTK_CSS_CHANGE_SOURCE|GTK_CSS_CHANGE_PARENT_STYLE)) | ((match & BASE_STATES) << SIBLING_SHIFT);
+  return (match & KEEP_STATES) | ((match & BASE_STATES) << SIBLING_SHIFT);
 
 #undef BASE_STATES
+#undef KEEP_STATES
 #undef SIBLING_SHIFT
 }