[gtksourceview] Don't use gtk_style_context_get_background_color() (deprecated)

[Sébastien Wilmet <swilmet src gnome org>]

commit c465187b3bf2bbb4333fbe7d0c73427aab964d3f
Author: Sébastien Wilmet <swilmet gnome org>
Date:   Wed Mar 11 13:26:41 2015 +0100

    Don't use gtk_style_context_get_background_color() (deprecated)
    
    The API says to use gtk_render_background() instead, but for the two
    cases here it isn't possible.
    
    In GtkSourceCompletion, the background color is applied to a GtkTreeView
    cell renderer, which doesn't support CSS.
    
    In GtkSourceStyleScheme, the background color is retrieved to generate
    CSS code. AFAIK it isn't possible in CSS to refer to the
    background-color value, especially since the background color can be
    modified by changing the style scheme, so it isn't always the default
    value.

 gtksourceview/gtksourcecompletion.c  |    8 +++++---
 gtksourceview/gtksourcestylescheme.c |    7 ++++---
 2 files changed, 9 insertions(+), 6 deletions(-)
---
diff --git a/gtksourceview/gtksourcecompletion.c b/gtksourceview/gtksourcecompletion.c
index 6738b0b..e80d9f8 100644
--- a/gtksourceview/gtksourcecompletion.c
+++ b/gtksourceview/gtksourcecompletion.c
@@ -1998,9 +1998,11 @@ init_tree_view (GtkSourceCompletion *completion,
                                             NULL);
 
        style_context = gtk_widget_get_style_context (GTK_WIDGET (completion->priv->tree_view_proposals));
-       gtk_style_context_get_background_color (style_context,
-                                               GTK_STATE_FLAG_INSENSITIVE,
-                                               &background_color);
+
+       gtk_style_context_get (style_context,
+                              GTK_STATE_FLAG_INSENSITIVE,
+                              "background-color", &background_color,
+                              NULL);
 
        g_object_set (cell_renderer,
                      "cell-background-rgba", &background_color,
diff --git a/gtksourceview/gtksourcestylescheme.c b/gtksourceview/gtksourcestylescheme.c
index 5610a5f..71813aa 100644
--- a/gtksourceview/gtksourcestylescheme.c
+++ b/gtksourceview/gtksourcestylescheme.c
@@ -655,9 +655,10 @@ get_cursors_css_style (GtkSourceStyleScheme *scheme,
 
                context = gtk_widget_get_style_context (widget);
 
-               gtk_style_context_get_background_color (context,
-                                                       GTK_STATE_FLAG_NORMAL,
-                                                       &secondary_color);
+               gtk_style_context_get (context,
+                                      GTK_STATE_FLAG_NORMAL,
+                                      "background-color", &secondary_color,
+                                      NULL);
 
                /* shade the secondary cursor */
                secondary_color.red *= 0.5;