[gtk/font-families: 1/2] css: Use multiple font-family values

[Matthias Clasen <matthiasc src gnome org>]

commit 1c9a486d608af5475162768f707d36386bed5e3c
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri May 3 01:18:42 2019 +0000

    css: Use multiple font-family values
    
    Pango API to support this, so we can implement
    this very easily.
    
    Closes: https://gitlab.gnome.org/GNOME/gtk/issues/1854

 gtk/gtkcssshorthandpropertyimpl.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)
---
diff --git a/gtk/gtkcssshorthandpropertyimpl.c b/gtk/gtkcssshorthandpropertyimpl.c
index fcd250befd..0ada0f6a3e 100644
--- a/gtk/gtkcssshorthandpropertyimpl.c
+++ b/gtk/gtkcssshorthandpropertyimpl.c
@@ -1143,8 +1143,18 @@ pack_font_description (GtkCssShorthandProperty *shorthand,
   v = (* query_func) (GTK_CSS_PROPERTY_FONT_FAMILY, query_data);
   if (v)
     {
-      /* xxx: Can we set all the families here somehow? */
-      pango_font_description_set_family (description, _gtk_css_string_value_get 
(_gtk_css_array_value_get_nth (v, 0)));
+      int i;
+      GString *s = g_string_new ("");
+
+      for (i = 0; i < _gtk_css_array_value_get_n_values (v); i++)
+        {
+          if (i > 0)
+            g_string_append (s, ",");
+          g_string_append (s, _gtk_css_string_value_get (_gtk_css_array_value_get_nth (v, i)));
+        }
+
+      pango_font_description_set_family (description, s->str);
+      g_string_free (s, TRUE);
     }
 
   v = (* query_func) (GTK_CSS_PROPERTY_FONT_SIZE, query_data);