Fix GTK default text/bg reset staging

src/fe-gtk/theme/tests/test-theme-preferences-gtk3-populate.c

@@ -68,6 +68,16 @@ theme_get_color (ThemeSemanticToken token, GdkRGBA *color)
         return TRUE;
 }
 
+void
+theme_get_widget_style_values_for_widget (GtkWidget *widget, ThemeWidgetStyleValues *out_values)
+{
+        (void)widget;
+        if (!out_values)
+                return;
+        gdk_rgba_parse (&out_values->foreground, "#111111");
+        gdk_rgba_parse (&out_values->background, "#f0f0f0");
+}
+
 void
 theme_manager_set_token_color (unsigned int dark_mode, ThemeSemanticToken token, const GdkRGBA *color, gboolean *changed)
 {