[gtk+/wip/cosimoc/range-gadget: 121/144] range: move GtkColorScale special case to GtkColorScale

[Cosimo Cecchi <cosimoc src gnome org>]

commit d63f3ec1bb81676d770a1de6c20152c93a75dc6f
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Mon Feb 22 18:27:52 2016 -0800

    range: move GtkColorScale special case to GtkColorScale
    
    Now we can just tweak the node visibility for it.

 gtk/gtkcolorscale.c |    5 +++++
 gtk/gtkrange.c      |    8 +-------
 2 files changed, 6 insertions(+), 7 deletions(-)
---
diff --git a/gtk/gtkcolorscale.c b/gtk/gtkcolorscale.c
index 5509c9c..bafcf1b 100644
--- a/gtk/gtkcolorscale.c
+++ b/gtk/gtkcolorscale.c
@@ -23,6 +23,7 @@
 #include "gtkgesturelongpress.h"
 #include "gtkcolorutils.h"
 #include "gtkorientable.h"
+#include "gtkrangeprivate.h"
 #include "gtkstylecontext.h"
 #include "gtkaccessible.h"
 #include "gtkprivate.h"
@@ -255,6 +256,7 @@ scale_draw (GtkWidget *widget,
 static void
 gtk_color_scale_init (GtkColorScale *scale)
 {
+  GtkCssNode *trough_node;
   GtkStyleContext *context;
 
   scale->priv = gtk_color_scale_get_instance_private (scale);
@@ -269,6 +271,9 @@ gtk_color_scale_init (GtkColorScale *scale)
 
   context = gtk_widget_get_style_context (GTK_WIDGET (scale));
   gtk_style_context_add_class (context, "color");
+
+  trough_node = gtk_range_get_trough_node (GTK_RANGE (scale));
+  gtk_css_node_set_visible (trough_node, FALSE);
 }
 
 static void
diff --git a/gtk/gtkrange.c b/gtk/gtkrange.c
index 2591a44..3dcd634 100644
--- a/gtk/gtkrange.c
+++ b/gtk/gtkrange.c
@@ -2268,14 +2268,8 @@ gtk_range_draw (GtkWidget *widget,
 {
   GtkRange *range = GTK_RANGE (widget);
   GtkRangePrivate *priv = range->priv;
-  gboolean draw_trough = TRUE;
-
-  if (GTK_IS_COLOR_SCALE (widget))
-      draw_trough = FALSE;
-
-  if (draw_trough)
-    gtk_css_gadget_draw (priv->trough_gadget, cr);
 
+  gtk_css_gadget_draw (priv->trough_gadget, cr);
   gtk_css_gadget_draw (priv->slider_gadget, cr);
 
   if (priv->stepper_a_gadget)