c55ffb5258
This improves implicit node inputs in multiple ways: * Fix crash when switching a group input socket type from e.g. vector to integer, while the default input is set to "position". Now, the default input type is reset automatically if it's invalid. * Add Left/Right Handle as possible implicit vector inputs (next to Position and Normal). Those were the only ones that we used internally that were not exposed yet. * When creating a new group input from an existing socket, also initialize the default input based on the socket. E.g. when grouping a `Set Position` node, the `Position` input of the group will now also use the position attribute by default. In addition to these user-level changes, some internal changes were done too: * Use unified `NodeDefaultInputType` in node declaration instead of function pointers which were hard to propagate to node groups. * Use a new reusable `socket_type_supports_default_input_type` function in rna to filter the list of possible input items. Pull Request: https://projects.blender.org/blender/blender/pulls/139139
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