[fix] Update edge tensors accordingly in leading boundary with IDMRG2 - #516
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Description
Leading boundary with IDMRG2 forgot to update one of the tensors in the right-to-left sweep, which caused space mismatches.
The test I added could've been put in the old bugs section, but where I put it has most of the code already compiled so it's less straining for CI.
This was not caught before I guess because in other cases the rank just saturates immediately, so pre-updated data in the sweeps don't space mismatch.
Checklist
julia --project=test test/runtests.jl, or the relevant subset)docs/src/)[Unreleased]indocs/src/changelog.md, if this PR is user-facing (new feature, behavior change, bug fix, deprecation, or removal)