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Is there something that triggers a re-render when the reference become available. What guarantee us that the rerender will happen?
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They are available through state provided by context. When there is a multi selection, the first and the last multi selected blocks both set their reference in this state, also creating a new array, so it causes a re-render for this component. The first and last node are not set at the same time though, so we have to wait until both are set.