[d-spy] build: set development highlight when specified

[Christian Hergert <chergert src gnome org>]

commit 9bd5edf0d0ec05583c33d0241fff9b2aeeb3ca56
Author: Christian Hergert <chergert redhat com>
Date:   Thu Sep 16 14:59:25 2021 -0700

    build: set development highlight when specified

 meson.build       | 1 +
 src/dspy-window.c | 4 ++++
 2 files changed, 5 insertions(+)
---
diff --git a/meson.build b/meson.build
index c58238d..c3825ab 100644
--- a/meson.build
+++ b/meson.build
@@ -19,6 +19,7 @@ config_h.set_quoted('PACKAGE_VERSION', meson.project_version())
 config_h.set_quoted('GETTEXT_PACKAGE', 'dspy')
 config_h.set_quoted('LOCALEDIR', join_paths(get_option('prefix'), get_option('localedir')))
 config_h.set_quoted('APP_ID', app_id)
+config_h.set10('DEVELOPMENT_BUILD', get_option('development'))
 
 glib_req_version = '2.68'
 gtk_req_version = '4.2'
diff --git a/src/dspy-window.c b/src/dspy-window.c
index 76c8419..8bad7aa 100644
--- a/src/dspy-window.c
+++ b/src/dspy-window.c
@@ -45,6 +45,10 @@ static void
 dspy_window_init (DspyWindow *self)
 {
   gtk_widget_init_template (GTK_WIDGET (self));
+
+#if DEVELOPMENT_BUILD
+  gtk_widget_add_css_class (GTK_WIDGET (self), "devel");
+#endif
 }
 
 GtkWidget *