Add a viewer node by default when enabling backdrop in compositor
Current state: You enable the backdrop checkbox, nothing happens at first. A viewer node has to be manually added and connected.
Desired state: After enabling the backdrop you automatically see the same output as as the Composite node as shown in the following screenshot.
Alternative desired state: As described above but the viewer node is not connected and shows a backdrop with instructions instead like: “Please connect the viewer node to see a backdrop image”.
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