[gtk+] Add a deprecation error for the engine css property

[Matthias Clasen <matthiasc src gnome org>]

commit d2d521d4b50a18f5c2fa215dc1ced0de86eec91e
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Nov 20 19:04:14 2015 -0500

    Add a deprecation error for the engine css property
    
    This helps people fix up their css.

 gtk/gtkcssprovider.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkcssprovider.c b/gtk/gtkcssprovider.c
index da7564b..bda3a91 100644
--- a/gtk/gtkcssprovider.c
+++ b/gtk/gtkcssprovider.c
@@ -2485,6 +2485,16 @@ parse_declaration (GtkCssScanner *scanner,
       return;
     }
 
+  if (strcmp (name, "engine") == 0)
+    {
+      gtk_css_provider_error (scanner->provider,
+                              scanner,
+                              GTK_CSS_PROVIDER_ERROR,
+                              GTK_CSS_PROVIDER_ERROR_DEPRECATED,
+                              "The '%s' property is ignored",
+                              name);
+    }
+
   if (!_gtk_css_parser_try (scanner->parser, ":", TRUE))
     {
       gtk_css_provider_invalid_token (scanner->provider, scanner, "':'");