e34e6373b6
This patch replaces the Composite node with the Group Output node as the primary compositor output. The old node was removed and versioned. This was done for consistency with Geometry Nodes and in preparation for more generic use of the compositor in VSE modifiers, layered compositing, NPR multi-stage compositing, and more. The Group Output node relies on the node tree interface, so we now have a default interface of a single input and a single output. For now, only the first input is considered while the rest are ignored, just like the Geometry Nodes design. Furthermore, the input is required to be of type color. Warnings and errors are issues if any of those are not met, also similar to Geometry Nodes. This introduces a new limitation: Composite outputs can no longer exist in node groups, since they obviously then act as their respective group outputs. A refactor for the compositor scheduler is needed to simplify the logic after this change, but this will be done in a separate patch. Pull Request: https://projects.blender.org/blender/blender/pulls/142232
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