Fix hist to preserve unrelated coord in multi-dim cases
#3530
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This fixes a bug in a newly introduced feature in #3501. Previously it was not possible to get into such a case because
histdid not support this mode of operation.Looking at the diff in that PR

it is evident that I had begun changing the code, but then keep the old way of computing
drop. I wonder if there is a static analysis tool that could catch something like this (thedropdefined on line 579 is unused)? Isn't it in some sense similar to an "unused argument" check?