Warn when property not found

Author: lenemter

lib/PropertyAnimator.vala

@@ -33,9 +33,15 @@ public class Gala.PropertyAnimator : Object {
             return;
         }
 
+        var attached_to_stopped = false;
         for (var i = 0; i < properties.length; i++) {
             var property = properties[i];
 
+            if (actor.find_property (property.property) == null) {
+                warning ("PropertyAnimator: Can't find property '%s'", property.property);
+                continue;
+            }
+
             Value actor_current_property = {};
             actor.get_property (property.property, ref actor_current_property);
 
@@ -50,8 +56,9 @@ public class Gala.PropertyAnimator : Object {
                 )
             };
 
-            if (i == 0) {
+            if (!attached_to_stopped) {
                 transition.stopped.connect (call_on_stopped);
+                attached_to_stopped = true;
             }
 
             actor.add_transition (property.property, transition);

vapi/mutter-clutter.vapi

@@ -7694,7 +7694,7 @@ namespace Clutter {
 	}
 	[CCode (cheader_filename = "clutter/clutter.h", type_cname = "ClutterAnimatableInterface", type_id = "clutter_animatable_get_type ()")]
 	public interface Animatable : GLib.Object {
-		public abstract unowned GLib.ParamSpec find_property (string property_name);
+		public abstract unowned GLib.ParamSpec? find_property (string property_name);
 		public abstract unowned Clutter.Actor get_actor ();
 		public abstract void get_initial_state (string property_name, GLib.Value value);
 		public abstract bool interpolate_value (string property_name, Clutter.Interval interval, double progress, out GLib.Value value);