[beast: 2/12] BST: adjust to use Item.check_is_a()

[Tim Janik <timj src gnome org>]

commit a4309994fdd74e8db786ad43038ff6cd3dbf3a18
Author: Tim Janik <timj gnu org>
Date:   Thu Sep 7 02:37:25 2017 +0200

    BST: adjust to use Item.check_is_a()
    
    Signed-off-by: Tim Janik <timj gnu org>

 beast-gtk/bstparam-item-seq.cc |   13 ++++++++-----
 1 files changed, 8 insertions(+), 5 deletions(-)
---
diff --git a/beast-gtk/bstparam-item-seq.cc b/beast-gtk/bstparam-item-seq.cc
index c477653..ceda8ff 100644
--- a/beast-gtk/bstparam-item-seq.cc
+++ b/beast-gtk/bstparam-item-seq.cc
@@ -101,11 +101,14 @@ param_item_seq_update (GxkParam  *param,
               for (i = 0; i < iseq->n_items; i++)
                 {
                   for (j = 0; j < pc->partitions->n_types; j++)
-                    if (bse_item_check_is_a (iseq->items[i], pc->partitions->types[j]))
-                      {
-                        partitions[j]++;
-                        break;
-                      }
+                    {
+                      Bse::ItemH item = Bse::ItemH::down_cast (bse_server.from_proxy (iseq->items[i]));
+                      if (item.check_is_a (pc->partitions->types[j]))
+                        {
+                          partitions[j]++;
+                          break;
+                        }
+                    }
                   if (j >= pc->partitions->n_types)
                     other++;
                 }