[gnome-builder/wip/gtk4-port: 471/736] libide/gui: add devel style to preferences

[Christian Hergert <chergert src gnome org>]

commit 67eaab5dde79f6fafe86298ce25db3bd0644f3a6
Author: Christian Hergert <chergert redhat com>
Date:   Wed Apr 6 20:47:51 2022 -0700

    libide/gui: add devel style to preferences

 src/libide/gui/ide-preferences-window.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/libide/gui/ide-preferences-window.c b/src/libide/gui/ide-preferences-window.c
index 65f4cfbe3..671deff93 100644
--- a/src/libide/gui/ide-preferences-window.c
+++ b/src/libide/gui/ide-preferences-window.c
@@ -480,6 +480,10 @@ ide_preferences_window_init (IdePreferencesWindow *self)
 
   gtk_widget_init_template (GTK_WIDGET (self));
   gtk_widget_add_css_class (GTK_WIDGET (self), "preferences");
+
+#ifdef DEVELOPMENT_BUILD
+  gtk_widget_add_css_class (GTK_WIDGET (self), "devel");
+#endif
 }
 
 GtkWidget *