This operator allows you to set the center of rotation for an image layer, and the center for texture retrieval via the Infill operator. Other places this is used are with the Rotation and Perspective operators, where it can optionally be used as the center for either kind of rotation.
When the layers dialog is open on a layered image, 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 operates within the context of the stacking operations.
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