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ENH: When using set_montage additional channels as extra points #8195

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@larsoner

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@larsoner

It might be better if we make it so that doing inst.set_montage, rather than discarding EEG channels that aren't in the instance, instead added them to info['dig'] as extra / headshape points. It should help with coreg, and make it so that we get consistent sphere fits any time the same montage is used. It would allow us to update the sphere argument of our topomap plotting functions to allow looking for EEG+extra dig points to enable 'auto' fit-based mode.

After #7455 is in, I might try a quick PR to see how this affects the topomaps.

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