[gtk+] testlevelbar: don't segfault when quitting testlevelbar

[Matthias Clasen <matthiasc src gnome org>]

commit 0555ef20a45e15c83f2698f276d105d686ea5c9f
Author: Cosimo Cecchi <cosimoc gnome org>
Date:   Fri Oct 24 14:53:26 2014 -0700

    testlevelbar: don't segfault when quitting testlevelbar
    
    Quit the mainloop when the window is closed.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=707695

 tests/testlevelbar.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)
---
diff --git a/tests/testlevelbar.c b/tests/testlevelbar.c
index 51b4af6..41dce8b 100644
--- a/tests/testlevelbar.c
+++ b/tests/testlevelbar.c
@@ -55,6 +55,15 @@ increase_level (gpointer data)
   return G_SOURCE_CONTINUE;
 }
 
+static gboolean
+window_delete_event (GtkWidget *widget,
+                     GdkEvent *event,
+                     gpointer _data)
+{
+  gtk_main_quit ();
+  return FALSE;
+}
+
 int
 main (int argc, char *argv[])
 {
@@ -72,6 +81,9 @@ main (int argc, char *argv[])
   gtk_container_add (GTK_CONTAINER (window), bar);
   gtk_widget_show_all (window);
 
+  g_signal_connect (window, "delete-event",
+                    G_CALLBACK (window_delete_event), NULL);
+
   g_timeout_add (100, increase_level, bar);
   gtk_main ();