fix #1254

Author: alainm23

core/Objects/Item.vala

@@ -1527,4 +1527,12 @@ public class Objects.Item : Objects.BaseObject {
 
         return project.is_archived;
     }
+
+    public bool exists_project (Objects.Project project) {
+        if (has_parent) {
+            return parent.exists_project (project);
+        }
+
+        return project_id == project.id;
+    }
 }

core/Services/Database.vala

@@ -1389,7 +1389,7 @@ public class Services.Database : GLib.Object {
         Gee.ArrayList<Objects.Item> return_value = new Gee.ArrayList<Objects.Item> ();
         lock (_items) {
             foreach (Objects.Item item in items) {
-                if (item.project_id == project.id) {
+                if (item.exists_project (project)) {
                     return_value.add (item);
                 }
             }