[gtk] cssanimatedstyle: Keep transition_info_add from recursing

[Timm Bäder <baedert src gnome org>]

commit ceb8aedf974fe1037e13735a6761b26713454369
Author: Timm Bäder <mail baedert org>
Date:   Thu Aug 22 13:14:57 2019 +0200

    cssanimatedstyle: Keep transition_info_add from recursing
    
    The slowest part of that fuction is the type check for
    GtkCssShorthandProperty. Subproperties of shorthand properties never
    refer to more shorthand properties however, so we don't want to have the
    type check for those.

 gtk/gtkcssanimatedstyle.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
---
diff --git a/gtk/gtkcssanimatedstyle.c b/gtk/gtkcssanimatedstyle.c
index ece7037bc6..4aa82c0fe9 100644
--- a/gtk/gtkcssanimatedstyle.c
+++ b/gtk/gtkcssanimatedstyle.c
@@ -203,8 +203,14 @@ transition_info_add (TransitionInfo    infos[GTK_CSS_PROPERTY_N_PROPERTIES],
       for (i = 0; i < len; i++)
         {
           GtkCssStyleProperty *prop = _gtk_css_shorthand_property_get_subproperty (shorthand, i);
+          guint id;
 
-          transition_info_add (infos, (GtkStyleProperty *)prop, index);
+          if (!_gtk_css_style_property_is_animated ((GtkCssStyleProperty *) prop))
+            continue;
+
+          id = _gtk_css_style_property_get_id ((GtkCssStyleProperty *) prop);
+          infos[id].index = index;
+          infos[id].pending = TRUE;
         }
     }
   else