[gtk] window: Fix the default value of mnemonics-visible

[Matthias Clasen <matthiasc src gnome org>]

commit 996f011ed8856f4d64b826354ccb4454f4f0bfaf
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Jun 23 14:55:10 2019 +0000

    window: Fix the default value of mnemonics-visible
    
    They aren't visible, so why should the property
    be TRUE?

 gtk/gtkwindow.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gtk/gtkwindow.c b/gtk/gtkwindow.c
index 74110cc5c3..3730841f36 100644
--- a/gtk/gtkwindow.c
+++ b/gtk/gtkwindow.c
@@ -903,7 +903,7 @@ gtk_window_class_init (GtkWindowClass *klass)
       g_param_spec_boolean ("mnemonics-visible",
                             P_("Mnemonics Visible"),
                             P_("Whether mnemonics are currently visible in this window"),
-                            TRUE,
+                            FALSE,
                             GTK_PARAM_READWRITE|G_PARAM_EXPLICIT_NOTIFY);
 
   /**