This operator allows you to set the center of rotation for an image layer.
One place this is used is when the layers dialog is open on that layered image. In that case, the center setting has no direct effect upon the image layer until/unless the layer is used in stacking, where it controls how the layer rotation within the stack operates.
Another place this is used is with the Rotation and Perspective operators, where it can optionally be used as the center for either kind of rotation.
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