748d98dff2
The `socket->index_in_tree()` method provides a unique index for that socket in the node tree (it's a cached runtime value). By construction, all input/output sockets of a node have consecutive numbers, but this (sometimes useful) fact is currently not exposed in the API. This patch adds new `input_socket_indices_in_tree` and `output_socket_indices_in_tree` methods to get the range of indices for all inputs or outputs of a node.
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