modelbutton: Center titles

The centering of titles was broken in b5b81dea7f2eff28.
Make it mostly work again by adding an empty end indicator.

Related: #3405

diff --git a/gtk/gtkmodelbutton.c b/gtk/gtkmodelbutton.c
index b6ce026da918859188961e498b11eda8767b874e..d01b0dba3bd7512bb9610c49d90c3190984964e9 100644 (file)
--- a/gtk/gtkmodelbutton.c
+++ b/gtk/gtkmodelbutton.c
@@ -489,7 +489,7 @@ update_node_name (GtkModelButton *self)
     {
     case GTK_BUTTON_ROLE_TITLE:
       start_name = "arrow";
-      end_name = NULL;
+      end_name = "";
       break;
     case GTK_BUTTON_ROLE_NORMAL:
       start_name = NULL;