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This is a temporary patch before we go all the way in with NiTransforms
in the sampling of BOLD on surfaces.
The anatomical _fast-track_ required to expose the fsnative-to-T1w
transform in the derivatives folder (which we were already doing in ITK
format).
When fMRIPrep ran without the fast-track, then the LTA transform would
be directly passed in without conversions. The fast-track PR forced the
implementation to use the ITK version.
This, in conjunction with the little trick to stick the BOLD shape and
zooms into the LTA (i.e., using ``lta_concatenate`` with an identity
transform with those features, shape and zooms, as moving) resulted in
an overly complex workflow that I partially implemented with
NiTransforms.
This PR gets rid of the concatenation with identity trick, using
NiTransforms to generate a transform equivalent to the concatenated LTA
we used to generate before the fast-track was introduced.
Resolves: nipreps#2145
Assign: @mgxd
Milestone: 20.1.0
Related: nipreps#2118, nipreps#2041, nipreps#2121.
Replacing this: https://github.com/poldracklab/fmriprep/blob/1d93d9e5599d08347ba2b85a4d4590a4c9273814/fmriprep/workflows/bold/registration.py#L456-L463
(will require nipy/nitransforms#64)
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