[gnumeric] GUI: Keep only one gnumeric.css provider around.

[Morten Welinder <mortenw src gnome org>]

commit a7f439ac511c85843993c322a97028ee21e5c992
Author: Morten Welinder <terra gnome org>
Date:   Fri Apr 5 09:19:44 2013 -0400

    GUI: Keep only one gnumeric.css provider around.
    
    ...as opposed to one per screen.

 ChangeLog     |    3 +++
 src/wbc-gtk.c |   15 +++++++++++----
 2 files changed, 14 insertions(+), 4 deletions(-)
---
diff --git a/ChangeLog b/ChangeLog
index c0a1044..b156238 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,8 @@
 2013-04-05  Morten Welinder  <terra gnome org>
 
+       * src/wbc-gtk.c (cb_screen_changed): Re-use the css provider for
+       new screens.
+
        * src/mathfunc.c (gnm_owent): New function.
 
 2013-04-04  Jean Brefort  <jean brefort normalesup org>
diff --git a/src/wbc-gtk.c b/src/wbc-gtk.c
index 50ebeff..b5621db 100644
--- a/src/wbc-gtk.c
+++ b/src/wbc-gtk.c
@@ -2300,13 +2300,18 @@ cb_screen_changed (GtkWidget *widget)
 {
        GdkScreen *screen = gtk_widget_get_screen (widget);
        const char *key = "wbcg-screen-css";
+       GObject *app = gnm_app_get_app ();
+       const char *app_key = "css-provider";
+       GtkCssProvider *css;
 
-       if (screen && !g_object_get_data (G_OBJECT (screen), key)) {
-               GtkCssProvider *css = gtk_css_provider_new ();
+       css = g_object_get_data (app, app_key); 
+       if (!css) {
                const char *resource = "gnm:gnumeric.css";
                const char *csstext = go_rsm_lookup (resource, NULL);
                gboolean debug = gnm_debug_flag ("css");
 
+               css = gtk_css_provider_new ();
+
                if (debug)
                        g_printerr ("Loading style from %s\n", resource);
                else
@@ -2315,12 +2320,14 @@ cb_screen_changed (GtkWidget *widget)
                                          NULL);
 
                gtk_css_provider_load_from_data (css, csstext, -1, NULL);
+               g_object_set_data_full (app, app_key, css, g_object_unref);
+       }
+
+       if (screen && !g_object_get_data (G_OBJECT (screen), key)) {
                gtk_style_context_add_provider_for_screen
                        (screen,
                         GTK_STYLE_PROVIDER (css),
                         GTK_STYLE_PROVIDER_PRIORITY_APPLICATION);
-               g_object_unref (css);
-
                g_object_set_data (G_OBJECT (screen), key, css);
        }
 }