[gtk/wip/baedert/css-values] widget: Get opacity without GtkStyleContext

[Timm Bäder <baedert src gnome org>]

commit 6ec28c3ad290a55c782f68a43cc73308b1c8bcfe
Author: Timm Bäder <mail baedert org>
Date:   Thu Jan 16 13:17:35 2020 +0100

    widget: Get opacity without GtkStyleContext
    
    GtkStyleContext is really just unnecessary here.

 gtk/gtkwidget.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)
---
diff --git a/gtk/gtkwidget.c b/gtk/gtkwidget.c
index 77c8107f22..dfc1ac5fab 100644
--- a/gtk/gtkwidget.c
+++ b/gtk/gtkwidget.c
@@ -10830,15 +10830,14 @@ static void
 gtk_widget_update_alpha (GtkWidget *widget)
 {
   GtkWidgetPrivate *priv = gtk_widget_get_instance_private (widget);
-  GtkStyleContext *context;
   gdouble opacity;
   guint8 alpha;
 
-  context = _gtk_widget_get_style_context (widget);
-  opacity =
-    _gtk_css_number_value_get (_gtk_style_context_peek_property (context,
-                                                                 GTK_CSS_PROPERTY_OPACITY),
-                               100);
+  opacity = _gtk_css_number_value_get (gtk_css_style_get_value (gtk_css_node_get_style (priv->cssnode),
+                                                                GTK_CSS_PROPERTY_OPACITY),
+                                       100);
+
+
   opacity = CLAMP (opacity, 0.0, 1.0);
   alpha = round (priv->user_alpha * opacity);