[balsa/gtk4: 199/246] toolbar-factory: add "toolbar" CSS class

[Peter Bloomfield <peterb src gnome org>]

commit 7cdac7f9288d55943a06dfd29256e8a05bc35a00
Author: Peter Bloomfield <PeterBloomfield bellsouth net>
Date:   Sat Oct 17 17:12:24 2020 -0400

    toolbar-factory: add "toolbar" CSS class

 src/toolbar-factory.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/src/toolbar-factory.c b/src/toolbar-factory.c
index 581c2b2ad..b21e0839b 100644
--- a/src/toolbar-factory.c
+++ b/src/toolbar-factory.c
@@ -831,5 +831,7 @@ balsa_toolbar_new(BalsaToolbarModel * model,
     gtk_widget_add_controller(toolbar, GTK_EVENT_CONTROLLER(key_controller));
     g_signal_connect(key_controller, "key-pressed", G_CALLBACK(tm_key_pressed), info);
 
+    gtk_widget_add_css_class(toolbar, "toolbar");
+
     return toolbar;
 }