scrolledwindow: Use a fully transparent background for the overlay window

The background will be already given and updated in the GtkScrollbar widget,
plus the background remained static on the window since it is realized.

diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 672d8eb6897e45e75594be92b2eaf25cd137164a..4ca59a71c269dcd1cf1c236269dd1b743509a8c3 100644 (file)
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -3349,6 +3349,7 @@ create_indicator_window (GtkScrolledWindow *scrolled_window,
                          GtkWidget         *child)
 {
   GtkWidget *widget = GTK_WIDGET (scrolled_window);
+  GdkRGBA transparent = { 0, 0, 0, 0 };
   GtkAllocation allocation;
   GdkWindow *window;
   GdkWindowAttr attributes;
@@ -3370,7 +3371,8 @@ create_indicator_window (GtkScrolledWindow *scrolled_window,
   window = gdk_window_new (gtk_widget_get_window (widget),
                            &attributes, attributes_mask);
   gtk_widget_register_window (widget, window);
-  gtk_style_context_set_background (gtk_widget_get_style_context (widget), window);
+
+  gdk_window_set_background_rgba (window, &transparent);
 
   if (scrolled_window->priv->touch_mode)
     gtk_widget_set_parent_window (child, window);