[BlockSparseArrays] Fix nested slicing in Julia 1.11 #1575
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mtfishman
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Fixes an issue listed in ITensor/BlockSparseArrays.jl#2 that was noticed in #1539 (which was dealt with in that PR by marking tests as broken) that some nested slicing operations broke in Julia 1.11. I think the cause was that some of the reindexing logic in SubArray changed and lead to views being created which we weren't handling properly.
The fix here is to impose that for some of our specialized index/slice objects, indexing is always eager, even if you try to take a view. This may not be the best long term solution, and probably we should make the indexing logic more generic to handle slices that are views to begin with, but it seems like a reasonable fix for the time being.