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IDG produces incorrect dirty images

The master version of IDG produces an incorrect dirty image. Left is a correct image, right an image produced with IDG: image

On another dataset, IDG shows artefacts at the edges of the image:

image

This issue can be reproduced by using test data that can be downloaded with a script in the wsclean repository: wsclean/scripts/download_mwa_ms.sh and the following command: wsclean -size 2048 2048 -scale 1amin -use-idg MWA_MOCK.ms

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