BUG: DataFrame.drop() does nothing for non-unique Datetime MultiIndex #12783
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git diff upstream/master | flake8 --diff
Closes #12701
Follows the suggested fix in the comments to the bug report.
Also added a line in whatsnew and a test.
Regarding the tests it passes the one I added. But I just noticed that plenty others fail and I have yet to find out whether it's caused by this (who knows, it might)
Update: It's the same tests failing on master branch as on this one (phew..). I guess the errors deserve bug reports but that's for another time.