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* Propagate the visible state when blocks connect This fixes #1967. In rendered connections when connecting: - If the superior connection is hidden this hides the newly connected block. - If the superior connection isn't hidden it makes sure the block is visible. In rendered connections when disconnecting: - If the superior connection is hidden, make the disconnected block stack visible. TODO before review: - write tests. - update collapsed message * Add missing overrides * Add tests for hidden connections and fix a bug while disposing