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The solution is to introduce a new object, the layout handle. A layout handle is a reference counting pointer to a layout. It can be obtained from a cell view and stored somewhere. If the cell view is closed, the layout will still exists as long as a layout handle exists. A layout handle can be used in LayoutView#show_layout in addition to the Layout object to re-open a layout that existed in a closed view.
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The solution is to introduce a new object, the layout handle. A layout handle is a reference counting pointer to a layout. It can be obtained from a cell view and stored somewhere. If the cell view is closed, the layout will still exists as long as a layout handle exists. A layout handle can be used in LayoutView#show_layout in addition to the Layout object to re-open a layout that existed in a closed view.