only apply full rewind to bitmap, not per block #3246
Merged
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Resolves #3245.
We still want to rewind per-block for the output_pos and MMRs themselves.
But we want to be careful and only apply a single aggregate rewind to the bitmap accumulator. This is safe to do as this is basically a "rebuild" of the bitmap, but kind of slow (so we only want to do this once).