The crop node default values produces an image of size 100x100. While
this is better than 0x0, it still makes the backdrop image look like it
disappeared after adding a crop node when the new image happens to be
behind a node.
Ideally, the default should be the render resolution, but we don't have
this information at node declaration time, so initialize width and
height to 1920 x 1080 such that the node has no apparent effect for the
default blend file.
<img width="216" alt="default.png" src="attachments/a904a92c-3c0c-4075-80ea-f6168bfb0966">
Pull Request: https://projects.blender.org/blender/blender/pulls/139493
2c271e2442