[gnome-builder] layout: sync active view primary color with stack header

[Christian Hergert <chergert src gnome org>]

commit 905b36230c723ff924db243db16f3f1cd43f8d87
Author: Christian Hergert <chergert redhat com>
Date:   Wed Jul 5 15:12:12 2017 -0700

    layout: sync active view primary color with stack header
    
    This allows the primary-color of the layout view to inform the
    layout stack header of its background color. Doing so makes the
    layout stack much less distracting.

 libide/layout/ide-layout-stack.c |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/libide/layout/ide-layout-stack.c b/libide/layout/ide-layout-stack.c
index e0f76cc..619a8e2 100644
--- a/libide/layout/ide-layout-stack.c
+++ b/libide/layout/ide-layout-stack.c
@@ -123,6 +123,7 @@ ide_layout_stack_bindings_notify_source (IdeLayoutStack  *self,
     {
       _ide_layout_stack_header_set_title (priv->header, _("No Open Pages"));
       _ide_layout_stack_header_set_modified (priv->header, FALSE);
+      _ide_layout_stack_header_set_background_rgba (priv->header, NULL);
     }
 }
 
@@ -567,6 +568,10 @@ ide_layout_stack_init (IdeLayoutStack *self)
                           priv->header, "modified",
                           G_BINDING_SYNC_CREATE);
 
+  dzl_binding_group_bind (priv->bindings, "primary-color",
+                          priv->header, "background-rgba",
+                          G_BINDING_SYNC_CREATE);
+
   g_signal_connect_object (priv->stack,
                            "notify::visible-child",
                            G_CALLBACK (ide_layout_stack_notify_visible_child),