[libhandy] preferences-group: Support CSS

[Alexander Mikhaylenko <alexm src gnome org>]

commit c9de1fe1451b398f5469ff53f7118c5a32e27078
Author: Adrien Plazas <kekun plazas laposte net>
Date:   Thu Dec 17 12:11:28 2020 +0100

    preferences-group: Support CSS

 src/hdy-preferences-group.c | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/src/hdy-preferences-group.c b/src/hdy-preferences-group.c
index 92f4e1ff..e19f7e0a 100644
--- a/src/hdy-preferences-group.c
+++ b/src/hdy-preferences-group.c
@@ -9,6 +9,7 @@
 
 #include "hdy-preferences-group-private.h"
 
+#include "hdy-css-private.h"
 #include "hdy-preferences-row.h"
 
 /**
@@ -233,6 +234,13 @@ hdy_preferences_group_class_init (HdyPreferencesGroupClass *klass)
 
   widget_class->destroy = hdy_preferences_group_destroy;
 
+  widget_class->size_allocate = hdy_css_size_allocate_bin;
+  widget_class->get_preferred_height = hdy_css_get_preferred_height;
+  widget_class->get_preferred_height_for_width = hdy_css_get_preferred_height_for_width;
+  widget_class->get_preferred_width = hdy_css_get_preferred_width;
+  widget_class->get_preferred_width_for_height = hdy_css_get_preferred_width_for_height;
+  widget_class->draw = hdy_css_draw_bin;
+
   container_class->add = hdy_preferences_group_add;
   container_class->remove = hdy_preferences_group_remove;
   container_class->forall = hdy_preferences_group_forall;