[gtk+/wip/baedert/drawing: 158/348] gizmo: Chain up in snapshot if no snapshot func given

[Timm Bäder <baedert src gnome org>]

commit a6b7021d487b143274d9d7be9a002add36ff6630
Author: Timm Bäder <mail baedert org>
Date:   Thu May 11 21:49:37 2017 +0200

    gizmo: Chain up in snapshot if no snapshot func given
    
    I.e. when gizmo users just want to draw child widgets anyway and don't
    do any custom drawing, they can simply pass NULL.

 gtk/gtkgizmo.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkgizmo.c b/gtk/gtkgizmo.c
index 5c065e5..38cd3d5 100644
--- a/gtk/gtkgizmo.c
+++ b/gtk/gtkgizmo.c
@@ -46,6 +46,8 @@ gtk_gizmo_snapshot (GtkWidget   *widget,
 
   if (self->snapshot_func)
     self->snapshot_func (self, snapshot);
+  else
+    GTK_WIDGET_CLASS (gtk_gizmo_parent_class)->snapshot (widget, snapshot);
 }
 
 static void