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Bugs
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Fix node groups for compositor (input/output access)
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Make sure only one output node is active at a time (NODE_DO_OUTPUT flag)
- Proposed design change: Only allow one link to an output (generally: any socket with 1 connection limit)
- Existing output node links get removed for inactive output nodes (~NODE_DO_OUTPUT)
- This will work better for mixed types of sockets with different connectivity than restricting the whole node
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Reimplement muted nodes for Cycles, using the internal_links lists for consistent behavior
- compiler errors in legacy compositor code, have to enable that
