[gtk] grid layout: Fix initial property values

[Matthias Clasen <matthiasc src gnome org>]

commit 8fa7de5563981c702809c66bf886b53bda932c85
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jun 28 12:40:25 2019 +0000

    grid layout: Fix initial property values
    
    Too bad that we don't cover layout children
    in the default value test - it would have
    caught this.

 gtk/gtkgridlayout.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/gtk/gtkgridlayout.c b/gtk/gtkgridlayout.c
index 8d54367a7d..aac06e1709 100644
--- a/gtk/gtkgridlayout.c
+++ b/gtk/gtkgridlayout.c
@@ -212,6 +212,8 @@ gtk_grid_layout_child_class_init (GtkGridLayoutChildClass *klass)
 static void
 gtk_grid_layout_child_init (GtkGridLayoutChild *self)
 {
+  CHILD_ROW_SPAN (self) = 1;
+  CHILD_COL_SPAN (self) = 1;
 }
 
 /**