Merge pull request #529 from bnmajor/deferred-methods

BUG: Use deferred methods list

Author: thewtex

itkwidgets/viewer.py

@@ -191,6 +191,8 @@ def queue_request(self, method, *args):
         if hasattr(self.viewer_rpc, 'itk_viewer'):
             fn = getattr(self.viewer_rpc.itk_viewer, method)
             fn(*args)
+        elif method in deferred_methods():
+            self.deferred_queue.put({'method': method, 'arg': args})
         else:
             self.queue.put({'method': method, 'arg': args})