[BUG] Fixed behavior of DataFrameGroupBy.apply to respect _group_selection_context #28554
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christopherzimmerman
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black pandasgit diff upstream/master -u -- "*.py" | flake8 --diffThere were lots of inconsistencies among tests about whether or not
applyshould return the grouper column(s), and almost no testing on the impact ofas_indexonapplyoperations. This hopefully should provide better coverage, and also normalize the behavior everywhere.