With Constrain to Image Bounds selected, UVs will be constrained to the correct/closest UDIM if the image is tiled. UVs will be constrained to the 0-1 UV space if the image is not tiled. This will override the present behavior of always constraining selected UVs to the 0-1 UV space (UDIM 1001). Reviewed By: campbellbarton Ref D11202