fix selections and cell change event sync

Signed-off-by: Itay Dafna <[email protected]>

Author: ibdafna

ipydatagrid/datagrid.py

@@ -70,7 +70,7 @@ def all(self):
         represented as a dictionary
         with keys 'r': row and 'c': column
         """
-        return list(self)
+        return [cell for cell in self]
 
     def all_values(self):
         """
@@ -279,7 +279,7 @@ def __init__(self, dataframe, **kwargs):
         self._cell_change_handlers = CallbackDispatcher()
         self.on_msg(self.__handle_custom_msg)
 
-    def __handle_custom_msg(self, _, content):  # noqa: U101,U100
+    def __handle_custom_msg(self, _, content, buffers):  # noqa: U101,U100
         if content["event_type"] == "cell-changed":
             row = content["row"]
             column = self._column_index_to_name(content["column_index"])