get_widget can fail #927

Although a reacton bug, it's happening in a solara context, so I thought for visibility it is better to post here.

Example 1
works, but Example 2 fails on get_widget when the Select changes.

The difference is:

# works
datagrid = ipydatagrid.DataGrid.element(dataframe=df_filtered, selection_mode="row")
# fails
datagrid = ipydatagrid.DataGrid.element(dataframe=df, selection_mode="row")

I can understand how this fails, since the parent (the implicit Column parent) will not rerender, breaking the relation between the element and the widget (it just ignores the new datagrid element, since it did not change).