6542c86ff5
The goal is to have a clear separation between active nodes and active viewers in a node tree. Both the compositor and geometry nodes viewers are supported. This will also allow us to implement shortcuts for viewers for geometry nodes.
A viewer node can be activated using
```
viewer_node = bpy.context.scene.node_tree.nodes["Viewer"]
with bpy.context.temp_override(node=viewer_node):
bpy.ops.node.activate_viewer()
```
Pull Request: https://projects.blender.org/blender/blender/pulls/134456
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