[seahorse/wip/nielsdg/delete-dialog-css] DeleteDialog: use "destructive-action" for Delete

[Niels De Graef <nielsdg src gnome org>]

commit a999b64895a40dc2944accf7bd53caba39608250
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Sat Mar 2 15:15:35 2019 +0100

    DeleteDialog: use "destructive-action" for Delete
    
    This will make the button turn red, which provides a warning to the
    user that this action is a removal (which might be irreversible).

 common/delete-dialog.vala | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/common/delete-dialog.vala b/common/delete-dialog.vala
index 5afa1237..013c81fd 100644
--- a/common/delete-dialog.vala
+++ b/common/delete-dialog.vala
@@ -89,6 +89,7 @@ public class DeleteDialog : Gtk.MessageDialog {
                cancel.show();
 
                var delet = new Gtk.Button.with_mnemonic(_("_Delete"));
+               delet.get_style_context().add_class("destructive-action");
                add_action_widget(delet, Gtk.ResponseType.OK);
                delet.show();
        }