[totem] backend: Work around popover-over-clutter issues

[Bastien Nocera <hadess src gnome org>]

commit 4c2242f2dbad9f0a2bdea49baceb7fae07b1c588
Author: Matthias Clasen <mclasen redhat com>
Date:   Mon Feb 3 15:53:08 2014 -0500

    backend: Work around popover-over-clutter issues
    
    Until GTK+ learns how to render popovers with transparency
    on top of native subwindows, we can make the GtkVolumeButton
    appear less broken by making it non-transparent.
    
    This still looks buggy with the popover arrow.
    
    Helps https://bugzilla.gnome.org/show_bug.cgi?id=723556

 src/backend/bacon-video-controls-actor.c |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)
---
diff --git a/src/backend/bacon-video-controls-actor.c b/src/backend/bacon-video-controls-actor.c
index 40cd27e..efbd1d4 100644
--- a/src/backend/bacon-video-controls-actor.c
+++ b/src/backend/bacon-video-controls-actor.c
@@ -89,6 +89,28 @@ setup_object (BaconVideoControlsActor *controls,
 }
 
 static void
+setup_popover (BaconVideoControlsActor *controls)
+{
+       GtkWidget *volume_button;
+       GtkStyleContext *context;
+       GtkCssProvider *provider;
+       const gchar volume_control_css[] =
+               "GtkPopover {\n"
+               "  border-radius: 0px;\n"
+               "  margin: 0px;\n"
+               "  padding: 0px;\n"
+               "}";
+
+       volume_button = GTK_WIDGET (g_object_get_data (G_OBJECT (controls), "volume_button"));
+       context = gtk_widget_get_style_context (gtk_scale_button_get_popup (GTK_SCALE_BUTTON 
(volume_button)));
+       provider = gtk_css_provider_new ();
+       gtk_css_provider_load_from_data (provider, volume_control_css, -1, NULL);
+       gtk_style_context_add_provider (context, GTK_STYLE_PROVIDER (provider),
+                                       GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
+       g_object_unref (provider);
+}
+
+static void
 bacon_video_controls_actor_init (BaconVideoControlsActor *controls)
 {
        const char *objects[] = { "toolbar", NULL };
@@ -107,6 +129,8 @@ bacon_video_controls_actor_init (BaconVideoControlsActor *controls)
        setup_object (controls, "volume_button");
        setup_object (controls, "time_label");
        setup_object (controls, "time_rem_label");
+
+       setup_popover (controls);
 }
 
 ClutterActor *