[gtk] testscale: Properly call gtk_main_quit

[Timm Bäder <baedert src gnome org>]

commit 1c8b746b4299f5d95d036154010f2ec32e78527b
Author: Timm Bäder <mail baedert org>
Date:   Fri Aug 9 10:33:52 2019 +0200

    testscale: Properly call gtk_main_quit

 tests/testscale.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/tests/testscale.c b/tests/testscale.c
index 484bb9c97c..33280dcf37 100644
--- a/tests/testscale.c
+++ b/tests/testscale.c
@@ -118,6 +118,7 @@ int main (int argc, char *argv[])
 
   window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
   gtk_window_set_title (GTK_WINDOW (window), "Ranges with marks");
+  g_signal_connect (window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
   box1 = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
   flipbox = box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 5);
   gtk_widget_set_hexpand (flipbox, TRUE);