[gtk+] settings: Ensure derived fields are initialized

[Matthias Clasen <matthiasc src gnome org>]

commit 1d0ba98d5df703c0936f2334733f68143f0831f2
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed May 4 06:28:59 2016 -0400

    settings: Ensure derived fields are initialized
    
    I mistakenly assumed that gtk_settings_init was already doing
    something to trigger a notify for all properties. It doesn't,
    so we have to ensure that settings_update_font_values() is
    called at least once.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=765966

 gtk/gtksettings.c |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)
---
diff --git a/gtk/gtksettings.c b/gtk/gtksettings.c
index 4b81ca1..a720d35 100644
--- a/gtk/gtksettings.c
+++ b/gtk/gtksettings.c
@@ -257,6 +257,7 @@ static void    settings_update_key_theme         (GtkSettings           *setting
 static gboolean settings_update_xsetting         (GtkSettings           *settings,
                                                   GParamSpec            *pspec,
                                                   gboolean               force);
+static void     settings_update_font_values      (GtkSettings           *settings);
 
 static void gtk_settings_load_from_key_file      (GtkSettings           *settings,
                                                   const gchar           *path,
@@ -356,6 +357,10 @@ gtk_settings_init (GtkSettings *settings)
   g_free (path);
 
   g_object_thaw_notify (G_OBJECT (settings));
+
+  /* ensure that derived fields are initialized */
+  if (priv->font_size == 0)
+    settings_update_font_values (settings);
 }
 
 static void
@@ -1966,15 +1971,18 @@ settings_update_font_values (GtkSettings *settings)
   PangoFontDescription *desc;
   const gchar *font_name;
 
-  priv->font_size = 0;
-  priv->font_size_absolute = FALSE;
-  priv->font_family = NULL;
+  g_free (priv->font_family);
 
   font_name = g_value_get_string (&priv->property_values[PROP_FONT_NAME - 1].value);
   desc = pango_font_description_from_string (font_name);
 
   if (desc == NULL)
-    return;
+    {
+      priv->font_size = 10 * PANGO_SCALE;
+      priv->font_size_absolute = FALSE;
+      priv->font_family = g_strdup ("Sans");
+      return;
+    }
 
   if (pango_font_description_get_set_fields (desc) & PANGO_FONT_MASK_SIZE)
     {