58ebe99d9d
In some cases, multiple viewers can be active and the active viewer is not the desired one. This is only a problem for the compositor The fix has two parts: 1. Tag the node tree as changed after the output changes. This solves the issue of two viewers being active at the same time 2. Deactivate all other viewers before activating the desired viewer node (similar to how `NODE_OT_activate_viewer()` works). This ensures that the only active viewer is the one that the user just set. Pull Request: https://projects.blender.org/blender/blender/pulls/138671
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