[gtk] testcalendar: Close window properly

[Matthias Clasen <matthiasc src gnome org>]

commit 3a727eed7a08e37109d380670e3ac4e1ad6eafb4
Author: Timm Bäder <mail baedert org>
Date:   Mon Jan 27 14:22:20 2020 +0100

    testcalendar: Close window properly

 tests/testcalendar.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/tests/testcalendar.c b/tests/testcalendar.c
index 6bc4b3690a..98481331a0 100644
--- a/tests/testcalendar.c
+++ b/tests/testcalendar.c
@@ -656,6 +656,7 @@ create_calendar(void)
   gtk_window_set_default_widget (GTK_WINDOW (window), button);
 
   gtk_window_set_default_size (GTK_WINDOW (window), 600, 0);
+  g_signal_connect (window, "close-request", G_CALLBACK (gtk_main_quit), NULL);
   gtk_widget_show (window);
 }