[gnome-builder/wip/gtk4-port] libide/gtk: add devel class to dialog

[Christian Hergert <chergert src gnome org>]

commit cc06de0d2cf93a63b048e14be3a4dd09cda34e43
Author: Christian Hergert <chergert redhat com>
Date:   Tue Jun 14 00:47:53 2022 -0700

    libide/gtk: add devel class to dialog

 src/libide/gtk/ide-shortcut-accel-dialog.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/libide/gtk/ide-shortcut-accel-dialog.c b/src/libide/gtk/ide-shortcut-accel-dialog.c
index f553a436b..b0aeffc83 100644
--- a/src/libide/gtk/ide-shortcut-accel-dialog.c
+++ b/src/libide/gtk/ide-shortcut-accel-dialog.c
@@ -332,6 +332,10 @@ ide_shortcut_accel_dialog_init (IdeShortcutAccelDialog *self)
   g_object_bind_property (self, "accelerator",
                           self->display_shortcut, "accelerator",
                           G_BINDING_SYNC_CREATE);
+
+#ifdef DEVELOPMENT_BUILD
+  gtk_widget_add_css_class (GTK_WIDGET (self), "devel");
+#endif
 }
 
 gchar *