reorganized filter actions

openpype/tools/launcher/models.py

@@ -183,14 +183,12 @@ class ActionModel(QtGui.QStandardItemModel):
         return icon
 
     def filter_actions(self):
+        self.items_by_id.clear()
         # Validate actions based on compatibility
         self.clear()
 
-        self.items_by_id.clear()
         actions = self.filter_compatible_actions(self._registered_actions)
 
-        self.beginResetModel()
-
         single_actions = []
         varianted_actions = collections.defaultdict(list)
         grouped_actions = collections.defaultdict(list)
@@ -273,12 +271,17 @@ class ActionModel(QtGui.QStandardItemModel):
 
             items_by_order[order].append(item)
 
+        self.beginResetModel()
+
+        items = []
         for order in sorted(items_by_order.keys()):
             for item in items_by_order[order]:
                 item_id = str(uuid.uuid4())
                 item.setData(item_id, ACTION_ID_ROLE)
                 self.items_by_id[item_id] = item
-                self.appendRow(item)
+                items.append(item)
+
+        self.invisibleRootItem().appendRows(items)
 
         self.endResetModel()